Must & Have to

Hello english learner!

Welcome to this course, here we will study the verbs Must and Have to and their differences.

– Both Have to and Must are used to express an obligation. But Must is subjective: it’s the speaker who thinks this is an obligation, but for ‘Have to’ the speaker is obliged.

  • I must stop smoking.
  • My parents warned me, I have to stop smoking.
  • The teacher is strict, you have to do your homework.
  • You must visit London, it’s a beautiful city.

as you see, ‘have to’ expresses an obligation due to outside effect, and ‘must’ is just an opinion of the speaker.

– Must is sometimes used to express a deduction, examples:

  • You ate the cake alone, it must be delicious.
  • everybody is talking about Messi, he must be a good player.

– In the negative forms the verbs have different meaning:

Must not means prohibition from doing something, it’s a strong obligation not to do it.

  • You mustn’t break the law.
  • The doctor told me that I must not drink alcohol.

Have not to means there is no necessity to do something:

  • The teacher is ill, I don’t have to go to school.
  • You don’t have to listen to me, you look busy.
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