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Learn some grammar rules

Here are the main points about must and have to.

1)   Both 'have to' and 'must' are used to express obligation.

You must stop eating so much.
You have to take some exercise.

2)   If something is an opinion or a rule you've made yourself, you're more likely to use 'must'.

I must remember to buy a birthday card for Alice today.

3)   The negative forms 'mustn't' and 'don't have to' have very different meanings.

You don't have to stop celebrating Christmas every day. (It’s not necessary to stop celebrating Christmas every day.)
You mustn't eat all that fatty food. (You must not eat fatty food. Don’t do it.)

4)   If you mustn't do something, it is necessary that you don't do it.

You mustn't eat all that fatty food.

5)   If you don't have to do something, it doesn't matter whether you do it or not.

You don't have to finish it today, you can give me it on Monday.

6)   Have to + infinitive (without ‘to') is the correct form.

You have to go
I have to remember 
Karen has to leave before 6 o'clock 

7)   'Have to' is more common in questions.

Do I have to pay now?
Does Kori have to play his music so loud?

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