MUST AND HAVE TO...
You must study You have to exercise
We use MUST and HAVE TO to say that it is necessary to do something. Sometimes, it doesn´t matter which you use:
* It is later than I thought I must go or I have to go.
But, there is a difference between must and have to and sometimes this is important.
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Must is personal. We use must when we
give our personal feelings.
You must do something.
I (the speaker) say it is necessary.
She is a really nice person. You must
meet her
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Have to is impersonal. We use have to for
facts, not for our feelings.
You have to do
something because of a rule or a situation.
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You can´t turn right here. You have to turn left (because of the traffic system).
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If you are not sure which to use, it is usually safer to use HAVE TO.
You can use must to talk about the present or future, but not the past.
* We must go now.
You can use have to in all forms.
* I had to go to hospital (past).
Must and don´t have to are completely different.
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You mustn´t do
something= it is necessary that you do not do it (so, don´t do it).
You must keep it a
secret. You mustn´t tell anyone.
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You don´t have to do
something= you don´t need to do it (but you can if you want).
I am not working
tomorrow, so I don´t have to get up early.
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ACTIVITIES
https://www.learnamericanenglishonline.com/Listening_Lab/Listening_Lab_Exercise_27_modal_verbs.html
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