6th Day Complete Guide to "Must" and "Ought To" in English

 6th Day Complete Guide to "Must" and "Ought To" in English

1. MUST - प्रयोग र नियमहरू

A. Strong Obligation (बलियो अनिवार्यता / अवश्य गर्नु पर्छ)

Used to express strong necessity or obligation. It is stronger than "should."

Strong Obligation	Must + Verb (Base Form)	You must wear a seatbelt.	तपाईंले सिटबेल्ट लगाउनु पर्छ।
Necessity	Must + Verb (Base Form)	All students must submit their homework.	सबै विद्यार्थीहरूले गृहकार्य बुझाउनु पर्छ।
Personal Duty	Must + Verb (Base Form)	I must visit my grandmother.	म मेरी हजुरआमालाई भेट्नु पर्छ।

More Examples:

• English: Employees must arrive on time.
• Nepali: कर्मचारीहरू समयमै आइपुग्नु पर्छ।
• English: You must follow the rules.
• Nepali: तपाईंले नियमहरू पालना गर्नुपर्छ।
• English: We must protect the environment.
• Nepali: हामीले वातावरणको संरक्षण गर्नुपर्छ।

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B. Prohibition (निषेध / गर्नु हुँदैन)

Used to express that something is not allowed. (Stronger than "shouldn't")

Prohibition	Must not / Mustn't + Verb	You mustn't smoke here.	तपाईंले यहाँ धुम्रपान गर्न हुँदैन।
Strong Prohibition	Must not / Mustn't + Verb	Visitors mustn't enter without permission.	आगन्तुकहरू अनुमति बिना पस्नु हुँदैन।

More Examples:

• English: You mustn't be late again.
• Nepali: तपाईं फेरि ढिलो हुनु हुँदैन।
• English: Students mustn't use mobile phones in class.
• Nepali: विद्यार्थीहरूले कक्षामा मोबाइल प्रयोग गर्नु हुँदैन।
• English: You mustn't tell anyone this secret.
• Nepali: तपाईंले यो गोप्य कुरा कसैलाई भन्नु हुँदैन।

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C. Strong Deduction (बलियो अनुमान / अवश्य नै हुनु पर्छ)

Used to express a logical conclusion or strong probability.

Strong Deduction	Must + Verb (Base Form)	She must be at home. (I'm sure)	उनी घरमा अवश्य हुनु पर्छ।
Logical Conclusion	Must + Verb (Base Form)	He must be tired after the long journey.	उनी लामो यात्रा पछि थाकेको हुनु पर्छ।

More Examples:

• English: They must have a lot of money.
• Nepali: उनीहरूसँग धेरै पैसा भएको हुनु पर्छ।
• English: You must be joking!
• Nepali: तपाईं ठट्टा गर्दै हुनुहुन्छ!
• English: It must be really cold outside.
• Nepali: बाहिर निकै चिसो भएको हुनु पर्छ।

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D. Past Obligation (भूतकालको अनिवार्यता / गर्नु पर्थ्यो)

Used to express obligation in the past.

Past Obligation	Had to + Verb (Base Form)	I had to work late yesterday.	मैले हिजो ढिलो सम्म काम गर्नुपर्यो।
Past Necessity	Had to + Verb (Base Form)	She had to take the bus.	उनले बस चढ्नु पर्यो।

Note: "Must" has no past form. Use "Had to" for past.

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E. Must + Have + V3 (Past Deduction)

Used to express a strong conclusion about the past.

Past Deduction	Must have + Past Participle	She must have gone home.	उनी गएकी हुनु पर्छ।
Strong Conclusion	Must have + Past Participle	He must have left early.	उनी चाँडै गएका हुनु पर्छ।

More Examples:

• English: They must have taken the wrong road.
• Nepali: उनीहरूले गलत बाटो समातेको हुनु पर्छ।
• English: I must have left my keys at home.
• Nepali: मैले मेरो साँचो घरमै छोडेको हुनु पर्छ।
• English: She must have forgotten our appointment.
• Nepali: उनले हाम्रो भेटघाट बिर्सनु भएको हुनु पर्छ।

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2. OUGHT TO - प्रयोग र नियमहरू

A. Advice / Moral Duty (सल्लाह / नैतिक कर्तव्य / गर्नु पर्छ)

Used to express what is morally right or good advice. Similar to "should" but more formal.

Moral Duty	Ought to + Verb (Base Form)	We ought to help the poor.	हामीले गरिबहरूलाई सहायता गर्नुपर्छ।
Good Advice	Ought to + Verb (Base Form)	You ought to see a doctor.	तपाईं डाक्टर जानु पर्छ।
Recommendation	Ought to + Verb (Base Form)	Students ought to study regularly.	विद्यार्थीहरूले नियमित अध्ययन गर्नुपर्छ।

More Examples:

• English: Parents ought to spend time with their children.
• Nepali: आमाबाबुले आफ्ना बच्चाहरूसँग समय बिताउनु पर्छ।
• English: You ought to apologize for your mistake.
• Nepali: तपाईंले आफ्नो गल्तीको लागि माफी माग्नु पर्छ।
• English: People ought to respect their elders.
• Nepali: मानिसहरूले वृद्धहरूको आदर गर्नुपर्छ।

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B. Expectation (अपेक्षा / हुनु पर्छ)

Used to express what is expected or likely to happen.

Expectation	Ought to + Verb (Base Form)	The train ought to arrive soon.	रेल चाँडै आइपुग्नु पर्छ।
Likely Situation	Ought to + Verb (Base Form)	She ought to be home by now.	उनी अहिले सम्म घर पुग्नु पर्छ।

More Examples:

• English: The report ought to be ready by Friday.
• Nepali: रिपोर्ट शुक्रबार सम्म तयार भएको हुनु पर्छ।
• English: He ought to pass the exam easily.
• Nepali: उनी परीक्षा सजिलै उत्तीर्ण गर्नु पर्छ।

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C. Negative Form: Ought Not / Oughtn't (गर्नु हुँदैन)

Used to give negative advice.

Negative Advice	Ought not + Verb	You oughtn't to stay up too late.	तपाईं धेरै ढिलो सम्म ब्यूँझिनु हुँदैन।
Negative Recommendation	Ought not + Verb	They oughtn't to waste water.	उनीहरूले पानी बर्बाद गर्नु हुँदैन।

More Examples:

• English: You oughtn't to drive so fast.
• Nepali: तपाईं यति छिटो गाडी चलाउनु हुँदैन।
• English: Children oughtn't to watch violent movies.
• Nepali: बच्चाहरूले हिंसात्मक चलचित्र हेर्नु हुँदैन।

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D. Ought to have + V3 (Past Regret)

Used to express regret about the past. Similar to "Should have."

Past Regret	Ought to have + Past Participle	I ought to have studied harder.	मैले कडा अध्ययन गर्नु पर्थ्यो।
Past Mistake	Ought to have + Past Participle	She ought to have called me.	उनले मलाई फोन गर्नुपर्थ्यो।

More Examples:

• English: We ought to have left earlier.
• Nepali: हामीले चाँडै हिड्नु पर्थ्यो।
• English: He ought to have asked for permission.
• Nepali: उनले अनुमति माग्नु पर्थ्यो।

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3. QUICK COMPARISON: MUST vs OUGHT TO vs SHOULD

Strong Obligation	✅ You must go.	❌ No	❌ No	तपाईं जानु पर्छ (बलियो)
Mild Obligation	❌ No	✅ You ought to go.	✅ You should go.	तपाईं जानु पर्छ (सल्लाह)
Prohibition	✅ Mustn't go.	❌ No	✅ Shouldn't go.	जानु हुँदैन
Strong Deduction	✅ She must be there.	❌ No	❌ No	उनी अवश्य त्यहाँ हुनु पर्छ।
Advice	❌ No	✅ Ought to try	✅ Should try	आजमाउनु पर्छ
Expectation	❌ No	✅ It ought to rain	✅ It should rain	पानी पर्नु पर्छ
Moral Duty	❌ No	✅ We ought to help	✅ We should help	हामीले सहायता गर्नु पर्छ
Past Regret	❌ No	✅ Ought to have	✅ Should have	गर्नु पर्थ्यो
Past Deduction	✅ Must have gone	❌ No	❌ No	गएको हुनु पर्छ

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4. COMMON MISTAKES (नेपाली विद्यार्थीहरूले गर्ने गल्तीहरू)

Mistake ❌Correction ✅Explanation
I must to go.	I must go.	"Must" + Base Form
She must went.	She must go.	"Must" + Base Form
You ought to went.	You ought to go.	"Ought to" + Base Form
I must go yesterday.	I had to go yesterday.	Use "Had to" for past
We mustn't to smoke.	We mustn't smoke.	"Mustn't" + Base Form
They ought to have went.	They ought to have gone.	Ought to have + Past Participle
He must likes it.	He must like it.	"Must" + Base Form

Golden Rule:
Must + Verb (Base Form) → No "to", no past form.
Ought to + Verb (Base Form) → Always keep "to."

✅ I must go.
✅ You ought to study.
✅ She must have arrived.

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5. MUST vs OUGHT TO: DETAILED COMPARISON

A. Strength of Obligation (अनिवार्यताको स्तर)

Must (Strong/Personal)Ought To (Moral/Advisory)Nepali
I must finish this report today. (Personal necessity)	I ought to finish this report today. (Moral duty)	मैले आज यो रिपोर्ट सक्नु पर्छ।
You must wear a helmet. (Rule)	You ought to wear a helmet. (Good idea)	तपाईंले हेलमेट लगाउनु पर्छ।

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B. Deduction vs Expectation (अनुमान vs अपेक्षा)

Must (Deduction - Certain)Ought To (Expectation - Likely)Nepali
She must be at home. (I'm sure)	She ought to be at home. (I expect)	उनी घरमा हुनु पर्छ।
He must be tired. (Logical)	He ought to be tired. (Likely)	उनी थाकेको हुनु पर्छ।

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C. Past Forms (भूतकाल)

Must (Past Deduction)Ought To (Past Regret)Nepali
Must have gone. (Strong conclusion)	Ought to have gone. (Regret)	गएको हुनु पर्छ।
Must have left. (I'm certain)	Ought to have left. (Was a good idea)	गएको हुनु पर्छ।

Important: "Must" cannot be used for past obligation. Use "Had to" instead.

❌ I must go yesterday.
✅ I had to go yesterday.

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6. ADVANCED STRUCTURES WITH MUST & OUGHT TO

A. Must + Be + Verb+ing (Continuous Deduction)

Must be + V+ing	She must be waiting for us.	उनी हामीलाई पर्खिरहेकी हुनु पर्छ।
Must be + V+ing	He must be sleeping now.	उनी अहिले सुतिरहेको हुनु पर्छ।

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B. Must + Have + Been + V+ing (Past Continuous Deduction)

Must have been + V+ing	She must have been driving all night.	उनी रातभर गाडी चलाइरहेकी हुनु पर्छ।
Must have been + V+ing	They must have been arguing.	उनीहरू बहस गरिरहेका हुनु पर्छ।

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C. Ought to + Be + Verb+ing (Continuous Advice)

Ought to be + V+ing	You ought to be studying now.	तपाईं अहिले पढिरहेको हुनु पर्छ।
Ought to be + V+ing	She ought to be helping her mother.	उनी आमालाई सहायता गरिरहेको हुनु पर्छ।

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D. Mustn't vs Don't Have To (फरक)

Mustn't (निषेध)Don't Have To (आवश्यक छैन)Nepali
You mustn't smoke.	You don't have to smoke. (Not necessary)	तपाईं धुम्रपान गर्नु हुँदैन। / गर्नु पर्दैन।
You mustn't be late.	You don't have to be early.	तपाईं ढिलो हुनु हुँदैन। / चाँडै हुनु पर्दैन।

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7. TIPS FOR IELTS USING MUST & OUGHT TO

Tip Example
Writing Task 2: Use "must" for strong recommendations	Governments must take immediate action.
Writing Task 2: Use "ought to" for moral arguments	Society ought to protect the vulnerable.
Writing Task 2: Use "mustn't" for prohibition	People mustn't ignore climate change.
Writing Task 2: Use "must have" for logical conclusions	The policy must have had some drawbacks.
Speaking: Use "ought to" for polite suggestions	You ought to try this restaurant.
Speaking: Use "must" for personal obligations	I must complete this project by Friday.
Avoid overusing "must"	Use "should" or "ought to" for variety.

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8. EXAMPLES IN DIFFERENT CONTEXTS

A. IELTS Writing Task 2 (Essay)

English:

Governments must invest more in healthcare infrastructure. Additionally, citizens ought to adopt healthier lifestyles. Wealthy nations must support developing countries in their fight against disease. We mustn't ignore the fact that prevention is better than cure. Scientists must have known about these challenges for years. We ought to have taken action earlier. Nevertheless, we must act now before it is too late.

Nepali:

सरकारहरूले स्वास्थ्य सेवा पूर्वाधारमा अवश्य लगानी गर्नु पर्छ। साथै, नागरिकहरूले स्वस्थ जीवनशैली अपनाउनु पर्छ। धनी राष्ट्रहरूले रोगविरुद्धको लडाईमा विकासशील देशहरूलाई सहायता गर्नुपर्छ। उपचार भन्दा रोकथाम राम्रो हो भन्ने तथ्यलाई हामीले बेवास्ता गर्न हुँदैन। वैज्ञानिकहरूले यी चुनौतीहरू वर्षौंदेखि जानेको हुनु पर्छ। हामीले पहिले नै कार्य गर्नुपर्थ्यो। जे भए पनि, हामीले धेरै ढिलो हुनु अघि नै अहिले कदम चाल्नु पर्छ।

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B. IELTS Speaking Part 2 (Cue Card)

English:

If I had to give advice to young people, I must say that education is the most important thing. They ought to focus on their studies. Additionally, they mustn't compare themselves to others. I think they ought to find their own passion. If I had known this earlier, I ought to have chosen a different career. But now, I must make the most of my current situation. Everyone must remember that success takes time.

Nepali:

यदि मैले युवाहरूलाई सल्लाह दिनु पर्यो भने, मैले शिक्षा सबैभन्दा महत्वपूर्ण कुरा हो भनी भन्नु पर्छ। उनीहरूले आफ्नो अध्ययनमा ध्यान दिनु पर्छ। साथै, उनीहरूले आफूलाई अरूसँग तुलना गर्नु हुँदैन। मलाई लाग्छ उनीहरूले आफ्नो रुचि पत्ता लगाउनु पर्छ। यदि मैले यो पहिले नै थाहा पाएको भए, मैले फरक करियर रोज्नु पर्थ्यो। तर अहिले, मैले मेरो वर्तमान अवस्थाको अधिकतम उपयोग गर्नु पर्छ। सबैले सम्झनु पर्छ कि सफलतालाई समय लाग्छ।

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C. Everyday Conversations (दैनिक कुराकानी)

English:

A: I must go to the bank today.
B: You ought to go early to avoid the queue.
A: Yes, I mustn't forget my documents.
B: You ought to make a list of things to bring.
A: Good idea. I must have left my ID card at home yesterday.
B: You ought to keep it in your wallet always.
A: You're right. I must be more careful.
B: And you oughtn't to delay these things.

Nepali:

A: म आज बैंक जानु पर्छ।
B: तपाईं लाइनबाट बच्न चाँडै जानु पर्छ।
A: हो, मैले मेरा कागजपत्र बिर्सनु हुँदैन।
B: तपाईंले ल्याउनु पर्ने सामानको सूची बनाउनु पर्छ।
A: राम्रो विचार। मैले हिजो मेरो आईडी कार्ड घरमै छोडेको हुनु पर्छ।
B: तपाईंले यो सधैं आफ्नो वालेटमा राख्नु पर्छ।
A: तपाईं सही हुनुहुन्छ। म अवश्य सावधान हुनु पर्छ।
B: र तपाईंले यी कुराहरू ढिला गर्नु हुँदैन।

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D. Formal Rules & Regulations (औपचारिक नियम)

English:

All employees must wear identification badges at all times. Visitors must report to the reception desk. Staff mustn't use company resources for personal purposes. Managers ought to conduct regular performance reviews. Everyone ought to complete the safety training annually.

Nepali:

सबै कर्मचारीहरूले सधैं पहिचान ब्याज लगाउनु पर्छ। आगन्तुकहरूले रिसेप्सनमा रिपोर्ट गर्नु पर्छ। कर्मचारीहरूले कम्पनीका स्रोतहरू व्यक्तिगत कामको लागि प्रयोग गर्नु हुँदैन। व्यवस्थापकहरूले नियमित कार्यसम्पादन समीक्षा गर्नु पर्छ। सबैले वार्षिक सुरक्षा तालिम पूरा गर्नु पर्छ।

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9. PRACTICE EXERCISES

Exercise 1: Fill in the blanks with Must or Mustn't

You ______ wear a helmet while riding a bike.	तपाईंले बाइक चलाउँदा हेलमेट लगाउनु पर्छ।
You ______ smoke in this building.	तपाईंले यस भवनमा धुम्रपान गर्नु हुँदैन।
Employees ______ be on time.	कर्मचारीहरू समयमै हुनु पर्छ।
You ______ touch the exhibits.	तपाईंले प्रदर्शनीहरूलाई छुनु हुँदैन।
I ______ finish this report by 5 PM.	मैले यो रिपोर्ट ५ बजे सम्म सक्नु पर्छ।
Children ______ play with fire.	बच्चाहरूले आगोसँग खेल्नु हुँदैन।

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Exercise 2: Fill in the blanks with Ought to or Oughtn't to

You ______ apologize for your mistake.	तपाईंले आफ्नो गल्तीको लागि माफी माग्नु पर्छ।
Students ______ waste their time.	विद्यार्थीहरूले आफ्नो समय बर्बाद गर्नु हुँदैन।
We ______ help the less fortunate.	हामीले अभागीहरूलाई सहायता गर्नु पर्छ।
You ______ drive so fast in the city.	तपाईंले शहरमा यति छिटो गाडी चलाउनु हुँदैन।
Parents ______ spend time with children.	आमाबाबुले बच्चाहरूसँग समय बिताउनु पर्छ।
People ______ ignore their health.	मानिसहरूले आफ्नो स्वास्थ्यको बेवास्ता गर्नु हुँदैन।

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Exercise 3: Choose the correct answer (Must/Ought to/Should)

"You ______ be at least 18 to vote." (Rule)	a) must b) ought to c) should	तपाईंले मतदान गर्न कम्तीमा १८ वर्षको हुनु पर्छ।
"You ______ try this restaurant." (Recommendation)	a) must b) ought to c) should	तपाईंले यो रेस्टुरेन्ट आजमाउनु पर्छ।
"She ______ be the new manager." (Deduction)	a) must b) ought to c) should	उनी नयाँ प्रबन्धक हुनु पर्छ।
"We ______ help the poor." (Moral duty)	a) must b) ought to c) should	हामीले गरिबहरूलाई सहायता गर्नु पर्छ।
"The train ______ arrive at 5 PM." (Expectation)	a) must b) ought to c) should	रेल ५ बजे आइपुग्नु पर्छ।
"I ______ have studied more." (Regret)	a) must b) ought to c) should	मैले अझ पढ्नु पर्थ्यो।

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Exercise 4: Fill in the blanks with Must have / Ought to have

She ______ (arrive) by now. She is never late.	उनी अहिले सम्म आइपुगेकी हुनु पर्छ।
You ______ (tell) me the truth earlier.	तपाईंले मलाई पहिले नै सत्य भन्नु पर्थ्यो।
He ______ (take) the wrong bus.	उनले गलत बस समातेको हुनु पर्छ।
We ______ (leave) before the traffic started.	हामीले ट्राफिक सुरु हुनु अघि हिड्नु पर्थ्यो।
They ______ (finish) the project by now.	उनीहरूले अहिले सम्म परियोजना सकिसकेको हुनु पर्छ।
I ______ (call) my mother yesterday.	मैले हिजो मेरी आमालाई फोन गर्नु पर्थ्यो।

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Answers (Check Yourself):

Exercise 1:

1.      must

2.      mustn't

3.      must

4.      mustn't

5.      must

6.      mustn't

Exercise 2:

1.      ought to

2.      oughtn't to

3.      ought to

4.      oughtn't to

5.      ought to

6.      oughtn't to

Exercise 3:

1.      a) must

2.      b) ought to / c) should

3.      a) must

4.      b) ought to / c) should

5.      b) ought to / c) should

6.      b) ought to / c) should

Exercise 4:

1.      must have arrived

2.      ought to have told

3.      must have taken

4.      ought to have left

5.      must have finished

6.      ought to have called

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10. SUMMARY TABLE: MUST vs OUGHT TO vs SHOULD

Strong Obligation	✅ Must go	❌ No	❌ No	जानु पर्छ (बलियो)
Moral Duty	❌ No	✅ Ought to help	✅ Should help	सहायता गर्नु पर्छ
Good Advice	❌ No	✅ Ought to try	✅ Should try	आजमाउनु पर्छ
Prohibition	✅ Mustn't	❌ No	✅ Shouldn't	गर्नु हुँदैन
Strong Deduction	✅ Must be	❌ No	❌ No	हुनु पर्छ (निश्चित)
Expectation	❌ No	✅ Ought to come	✅ Should come	आउनु पर्छ
Past Deduction	✅ Must have gone	❌ No	❌ No	गएको हुनु पर्छ
Past Regret	❌ No	✅ Ought to have gone	✅ Should have gone	गएको हुनु पर्थ्यो
Formal Documents	✅ Employees must	❌ No	❌ No	गर्नु पर्छ (नियम)
Formal Writing	✅ Yes	✅ Yes (formal)	✅ Yes (less formal)

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11. QUICK TIPS FOR IELTS

Tip Example
Writing Task 2: Use "must" for urgent recommendations		Governments must act on climate change.
Writing Task 2: Use "ought to" for moral arguments		Society ought to protect the vulnerable.
Writing Task 2: Use "should" for general advice		People should recycle more.
Writing Task 2: Use "must have" for logical deductions		The policy must have had negative effects.
Writing Task 2: Use "ought to have" for past regrets		Governments ought to have invested earlier.
Speaking: Use "must" for personal obligations		I must finish my work today.
Speaking: Use "ought to" for polite suggestions	You ought to visit the museum.
Speaking: Use "mustn't" for strong warnings	You mustn't forget to bring your ID.

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12. DIFFERENCE BETWEEN MUST & HAVE TO

Must (Personal/Internal)Have To (External/Authority)Nepali
I must finish this project. (I feel this)	I have to finish this project. (My boss says)	मैले यो परियोजना सक्नु पर्छ।
You must see this film! (Recommendation)	I have to go to work. (External obligation)	तपाईंले यो फिल्म हेर्नु पर्छ!

Present: Must / Have to
Past: Had to (Must has no past form)

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13. DIFFERENCE BETWEEN OUGHT TO & SHOULD

Ought To (Formal/Stronger)Should (More Common)Nepali
You ought to respect your parents.	You should respect your parents.	तपाईंले आफ्ना आमाबाबुको आदर गर्नु पर्छ।
We ought to help the needy.	We should help the needy.	हामीले असहायहरूलाई सहायता गर्नु पर्छ।

Note: "Ought to" is more formal and expresses a stronger moral duty.

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14. RAPID FIRE QUIZ

Change these sentences using Must, Ought to, or their negative forms:

English SentenceNepali MeaningYour Answer
It is necessary to submit the form.	फारम बुझाउनु अनिवार्य छ।	You __________
It is forbidden to park here.	यहाँ पार्क गर्न निषेध छ।	You __________
It is good advice to exercise daily.	दैनिक व्यायाम गर्नु राम्रो हो।	You __________
I'm sure she is at home.	म पक्का छु उनी घरमा हुनुहुन्छ।	She __________
I regret not telling the truth.	मलाई सत्य नभनेको अफसोस छ।	I __________

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Answers:

1.      You must submit the form.

2.      You mustn't park here.

3.      You ought to / should exercise daily.

4.      She must be at home.

5.      I ought to have / should have told the truth.

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15. FULL COMPARISON: ALL MODAL VERBS

Can	Ability/Permission	Moderate	I can swim.	म पौडी खेल्न सक्छु।
Could	Past Ability/Polite	Moderate	I could run fast.	म छिटो दौडन सक्थे।
Will	Future/Promise	Moderate	I will help.	म सहायता गर्नेछु।
Would	Past Habit/Polite	Moderate	I would play.	म खेल्थे।
Shall	Future (I/We)/Offer	Formal	Shall we go?	के हामी जाऔं?
Should	Advice/Obligation	Mild	You should study.	तपाईं पढ्नु पर्छ।
May	Permission/Possibility	Formal	It may rain.	पानी पर्न सक्छ।
Might	Less Certain Possibility	Low	It might rain.	पानी पर्न सक्छ (कम)।
Must	Strong Obligation/Deduction	Strong	You must go.	तपाईं जानु पर्छ।
Ought To	Moral Duty/Advice	Strong	You ought to help.	तपाईंले सहायता गर्नु पर्छ।
Have To	External Obligation	Strong	I have to go.	म जानु पर्छ (बाह्य)।
Need To	Necessity	Moderate	I need to go.

 

50 Fill-in-the-Blank Exercises: Must / Must Not / Ought To / Ought Not To

Fill in the Blanks (1–50)

1.      You ______ brush your teeth twice a day. (must / ought to)

2.      Visitors ______ park in the reserved area only. (must / ought to)

3.      She ______ apologise for her rude behaviour. (must / ought to)

4.      You ______ not lie to your parents. (must / ought)

5.      We ______ respect our elders. (must / ought to)

6.      He ______ be at work by 9 AM; it's a company rule. (must / ought to)

7.      You ______ see that movie; it's amazing! (must / ought to)

8.      Students ______ not use mobile phones during exams. (must / ought)

9.      I ______ finish this report today; my boss needs it. (must / ought to)

10. You ______ eat more vegetables for good health. (must / ought to)

11. They ______ not enter this restricted zone. (must / ought)

12. She ______ take that job; it's a great opportunity. (must / ought to)

13. We ______ save water whenever possible. (must / ought to)

14. He ______ not smoke inside the building. (must / ought)

15. You ______ call your mother more often. (must / ought to)

16. Passengers ______ fasten their seatbelts. (must / ought to)

17. I ______ not forget to lock the door. (must / ought)

18. You ______ try this new restaurant; the food is excellent. (must / ought to)

19. Children ______ not play with matches. (must / ought)

20. We ______ reduce our carbon footprint. (must / ought to)

21. He ______ be tired after working all day. (must / ought to) – deduction

22. You ______ not waste your time on trivial things. (must / ought)

23. She ______ wear a helmet while riding. (must / ought to)

24. We ______ obey traffic rules. (must / ought to)

25. They ______ not copy answers during the test. (must / ought)

26. You ______ apologize to her immediately. (must / ought to)

27. He ______ take his medicine regularly. (must / ought to)

28. I ______ not eat too much sugar; it's unhealthy. (must / ought)

29. You ______ read this book; it changed my life. (must / ought to)

30. Citizens ______ pay their taxes on time. (must / ought to)

31. She ______ not stay up so late every night. (must / ought)

32. We ______ help the poor whenever we can. (must / ought to)

33. He ______ be the one who took my pen. (must / ought to) – deduction

34. You ______ not drive without a valid license. (must / ought)

35. They ______ consult a doctor immediately. (must / ought to)

36. I ______ not ignore my health any longer. (must / ought)

37. You ______ wear formal attire to the interview. (must / ought to)

38. Students ______ submit their assignments by Friday. (must / ought to)

39. He ______ not speak rudely to his teachers. (must / ought)

40. We ______ plant more trees to save the environment. (must / ought to)

41. She ______ be home by now; her flight landed early. (must / ought to) – deduction

42. You ______ not leave your luggage unattended. (must / ought)

43. They ______ start preparing for the exam early. (must / ought to)

44. He ______ not betray his friend's trust. (must / ought)

45. We ______ respect other people's opinions. (must / ought to)

46. You ______ drink at least 8 glasses of water daily. (must / ought to)

47. I ______ not procrastinate any further. (must / ought)

48. She ______ improve her communication skills. (must / ought to)

49. Employees ______ not use office computers for personal work. (must / ought)

50. We ______ always tell the truth. (must / ought to)

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Answers with Short Reasons

No.	Answer	Reason
1	ought to	Moral advice/recommendation
2	must	Rule/compulsion (parking rule)
3	ought to	Moral duty/suggestion
4	must not	Strong prohibition
5	ought to	Moral obligation
6	must	Company rule/necessity
7	must	Strong recommendation
8	must not	Exam rule/prohibition
9	must	External compulsion (boss needs it)
10	ought to	Health advice (less forceful)
11	must not	Strict prohibition
12	ought to	Recommendation/advice
13	ought to	Moral/environmental advice
14	must not	Building rule/prohibition
15	ought to	Personal advice
16	must	Safety regulation/compulsion
17	must not	Important negative obligation
18	must	Strong personal recommendation
19	must not	Safety prohibition for children
20	ought to	Moral/environmental suggestion
21	must	Logical deduction (certainty)
22	ought not to	Advice against wasting time
23	must	Safety rule/compulsion
24	ought to	Moral/civic duty (less forceful)
25	must not	Strict exam prohibition
26	must	Strong moral compulsion
27	ought to	Medical advice (less forceful)
28	ought not to	Health advice against
29	must	Strong personal recommendation
30	ought to	Civic duty (less forceful)
31	ought not to	Health advice (not a strict rule)
32	ought to	Moral obligation
33	must	Logical deduction (almost certain)
34	must not	Legal prohibition
35	ought to	Medical advice
36	ought not to	Personal advice against
37	must	Interview rule/expectation
38	must	Strict deadline/compulsion
39	must not	Moral/professional prohibition
40	ought to	Environmental suggestion
41	must	Logical deduction (certain)
42	must not	Security rule
43	ought to	Academic advice (not compulsory)
44	must not	Strong moral prohibition
45	ought to	Moral/social advice
46	ought to	Health recommendation (not strict)
47	ought not to	Personal advice against
48	ought to	Improvement advice
49	must not	Company policy/prohibition
50	ought to	Moral/ethical advice (less forceful than "must")

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Quick Rule Summary

Modal	Use
Must	Strong obligation, necessity, rules, laws, logical deduction
Must not	Strong prohibition (not allowed)
Ought to	Moral duty, advice, recommendation (weaker than must)
Ought not to	Negative advice / moral disapproval (weaker than must not)

Key Difference

• Must = internal or external compulsion / rule / certainty
• Ought to = recommendation / moral duty / good idea (less forceful)