We use have to/has to and must to say that
something is necessary.
- I have to wear glasses for reading.
- lt's later than I thought. I must go.
- She must clean her room.
- He doesn't have to work on Sundays.
When we use the past, or
the future with will, we need a form of have to.
- I had to spend the whole day with my mother last
Friday.
- They can't fix my computer, so I will have to buy a new
one.
- I will have to get a new passport.
We normally use
"have to" for a general obligation from an outside source.
- I have to go to work at 8 tomorrow morning
- I have to be quiet. I’m at the exam.
We normally use
"must" when the speaker imposes the obligation, such as a teacher to
students, or even to yourself.
- The students must study English at least ten hour a
week.
- I must lose some weight
- I must finish this novel till tomorrow morning. I will
return it to the library.
Have got to means the
same as have to, but have got to is informal.
- We’ve got to buy a ticket.
- Drivers have got to get a license to drive a car in the
US.
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