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.