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               Have to







Veja o uso de 'have to' segundo a gramática inglesa.

A I have to do something = it is necessary for me to do it, I am abliged to do it.

    I'll be late for work tomorrow.
I have to go to the dentist.
    Jill starts work at 7 o'clock, so
she has to get up at 6.
   
You have to pass a test before you can get a driving licence.


B The past (yesterday / last week etc.) is had to...:

    I was late for work yesterday.
I had to go to the dentist.
   
We had to walk home last night. There were no buses.


C Questions and negatives we use do / does (present) and did (past)

     What time
do you have to go to the dentist tomorrow?
    
Does Jill have to work on Sunday?
     Why
did they have to leave the party early?
  
    
I don't have to (do something) = it is not necessary to do it:

     I'm not working tomorrow, so
I don't have to get up early.
    
We didn't have to wait very long for the bus.


D must and have to

    Use
must or have to when you say what you think is necessary, when you give your opinion:

    - It's a fantastic film. You must see it. or You have to see it.

    When you are not giving your personal opinion, use
have to (not must):

    - Jill won't be at work this afternoon.
She has to go to the doctor. (this is not my personal opinion - it is
       a fact)

    - In many countries, men
have to do military service. (this is not my opinion - it is the law in
      those contries)

Exercises   
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