"Must" implies a personal, internal obligation or a strong recommendation from the speaker
I must call my mom - self-imposed.
- Internal Obligation: I must try harder at work. (I want to)
- Formal Rule: Passengers must wear seatbelts.
- Prohibition: You mustn't smoke here.
- You mustn't park here -Mustn't: Prohibition—do not do this
It is often used in formal writing or to indicate a strong, urgent necessity.
"Have to" indicates an external obligation, such as rules, laws, or situations
I have to wear a uniform at work -External,company rule.
- External Obligation: I have to be at work at 8 a.m. (My boss requires it)
Lack of Necessity: You don't have to bring food
Don't have to: No obligation—it is not necessary (e.g., "You don't have to come early
It is more common in spoken.
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You have to wear a helmet when you ride a bike. It's the law in this city.
Use 'have to' for external obligations like laws and rules. The law requires wearing a helmet, so it's not your personal choice
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You mustn't smoke in the hospital. It's not allowed.
Use 'mustn't' for prohibition - when something is not allowed. Smoking is forbidden in hospitals
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I have to finish this work today. My boss gave me a deadline.
Use 'have to' when someone else (like your boss) requires you to do something. This is an external obligation, not your personal decision.
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You don't have to bring anything to the party. We have plenty of food.
Use 'don't have to' for no obligation - it's not necessary. They have plenty of food, so bringing something is optional.
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She has to take medicine every day. Her doctor told her to do this.
Use 'have to' when following a doctor's instructions. The doctor requires this, so it's an external obligation.
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We mustn't forget to lock the door when we leave. It's very dangerous.
Use 'mustn't' here meaning it's very important not to forget. Not locking the door would be dangerous.
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I have to wear a uniform at my school. It's a school rule for all students.
Use 'have to' for school rules and regulations. This is what the school requires, not your personal choice.
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You don't have to pay for parking on Sundays. It's free!
Use 'don't have to' for no obligation. Parking is free on Sundays, so payment isn't necessary.
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Children have to go to school until age 16. Education is required by law here.
Use 'have to' for legal requirements and laws. The law requires education, so this is an external obligation.
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You mustn't touch the paintings in the museum. It's against the rules.
Use 'mustn't' for prohibition. Museum rules forbid touching the paintings to protect them.
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I must see a dentist soon. My tooth really hurts!
Use 'must' when you feel a strong personal need or urgency. You feel the pain and know you need to see a dentist - this is your personal decision.
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We don't have to wake up early tomorrow. It's Saturday and we can sleep late.
Use 'don't have to' for no obligation. It's Saturday, so waking up early isn't necessary.
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You mustn't use your phone during the exam. It's forbidden.
Use 'mustn't' for prohibition. Using phones during exams is forbidden by school rules.
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She must study hard if she wants to pass the test. I really think it's important!
Use 'must' for strong personal opinions and advice. You believe studying hard is very important - this is your strong recommendation.
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I have to get up at 6 AM every day because my job starts at 7 AM.
Use 'have to' when an external situation forces you to do something. Your job schedule requires you to wake up early - it's not your choice
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You mustn't be late for class. The teacher gets angry.
Use 'mustn't' to express strong advice not to do something. Being late makes the teacher angry, so it should be avoided
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We don't have to rush. We have plenty of time before the movie starts.
Use 'don't have to' for no obligation. They have plenty of time, so rushing isn't necessary.
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You must be quiet in the library. I'm trying to study and your talking is bothering me!
Use 'must' when expressing a strong personal request or opinion. You personally need quiet to study, so you're strongly asking for this.
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I don't have to eat meat. I'm a vegetarian by choice.
Use 'don't have to' for no obligation. Being vegetarian is a choice, so eating meat isn't necessary (not an obligation).
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Students mustn't run in the hallways. It's dangerous.
Use 'mustn't' for prohibition. Running in hallways is forbidden because it's dangerous
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Must / mustn’t
Use must + infinitive without to
Must is a modal verb, and modal verbs are followed by an infinitive without to.
- I must to go to the doctor.
- I must go to the doctor.
No -s
Modal verbs don’t add -s after he/she/it.
- He must comes with us.
- He must come with us.
Use must/mustn’t in negatives and questions
Must is an auxiliary verb. This means that it has a negative and an interrogative form. Do not use do/did in negatives and questions.
- We don’t must arrive early.
- We mustn’t arrive early.
- Do we must arrive early?
- Must we arrive early?
Have to/don’t have to
Use do and did in negatives and questions
The verb have in have to is not an auxiliary verb. Use do/don’t, does/doesn’t, did/didn’t in questions and negative sentences in present and past.
- Have you to get up early tomorrow?
- Do you have to get up early tomorrow?
- Did you have to buy a new sound card?
- We don’t have to stay until the end.
No contraction
The verb have in have to cannot be contracted to ‘ve.
- I‘ve to study for the exam tomorrow.
- I have to study for the exam tomorrow.
Past and future forms
Only have to has a past and a future form. Must does not have a past or a future form.
- Yesterday, I must take a taxi.
- Yesterday, I had to take a taxi.
- You will must take a taxi if it rains tomorrow.
- You will have to take a taxi if it rains tomorrow.
Have to
Rules and obligations
We use have to to talk about rules and obligations, something that is necessary.
- I have to get to work before 7 tomorrow.
- The car broke down and we had to call a taxi.
Must
Rules and obligations
Must is very similar to have to. We use must + infinitive (without to) to talk about rules and obligations.
- I must go to the doctor.
- I must get up early tomorrow.
Don’t have to
Don’t need to – not necessary
If you don’t have to do something, it means that you ‘don’t need to’ do something (there is no obligation). You can do it but you don’t need to do it if you don’t want to do it.
- You don’t have to pick me up at the station. I can take a taxi. (=You can pick me up, but you don’t need to do it).
Mustn’t
Prohibition
Use mustn’t to talk about something that you can’t do. It’s necessary that you don’t do it.
- You mustn’t call me before 8. (=You can’t call me before 8.)
- I mustn’t lose my concentration now.
Must vs have to
Must
Obligation from the speaker
We normally use must to talk about obligations that come from the opinion of the speaker. The speaker thinks it’s necessary or important to do something.
- MANAGER: You must get up early tomorrow. The meeting is at nine. (=The obligation comes from the manager. The manager thinks it’s necessary.)
- DOCTOR: You must stop smoking. (=It’s the doctor’s opinion. The doctor thinks it’s necessary.)
- SMOKER: I must stop smoking. (=It’s the smoker’s opinion. The smoker thinks it’s necessary to stop smoking.)
Have to
External obligation
We normally use have to when there’s an external obligation. The obligation doesn’t come from the speaker’s opinion; another person thinks it’s necessary.
- WORKER: We have to get up early tomorrow. The meeting is at nine. (=The obligation comes from the manager, not from the worker.)
- SMOKER: I have to stop smoking. (=It’s the doctor’s opinion, not the smoker’s opinion. The doctor thinks it’s necessary.)
Mustn’t vs don’t have to
Don’t have to
You don’t need to do it; not necessary; no obligation
Don’t have to and mustn’t have opposite meanings. We say that we don’t have to do something when we don’t need to do something; we can do it, but it’s not necessary.
- You don’t have to wait here. (=You can do it, but it’s not necessary)
Mustn’t
Prohibition; it’s necessary that you don’t do it
We say that we mustn’t do something when we cannot do something; it is necessary that we don’t do something.
- You mustn’t wait here. (=You cannot do it; it’s against the rules)
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