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The modal verb УHave ToФ differs from the others in that it is not defective It can have the category of person and number and all tense-aspect forms as well as verbals. It is followed by УTO-InfinitiveФ

We had to look all over the town before we found what we wanted.

She will not have to wait for you.

УHave ToТ builds up its interrogative and negative forms with the help of the auxiliary verb УTo DoФ.

Do you have to work hard?

He doesnТt have to do what she tells him.

It is used to express:

  • Obligation or necessity arising out of some circumstances .It is similar to its meaning with СMustФ

She is usually short of time so she has to go by air.

In the past tense УHave toФ indicates a fulfilled obligation

We had to do a lot of things so we stayed in the country/we obliged and did it/.

УHave to У replaces УMustФ when УMustФ cannot be used:

  • To express past necessity or obligation

We had to do it again.

  • To express absence of necessity since ТMUSTТ + not means prohibition

You must not do it/Prohibition/

You donТt have to make another copy of the document. This one will be enough/in the sense of ФNeednТtФ/.

  • To express future obligation .The future of УHave ToФ makes toe obligation more precise.

YouТll have to take a taxi if you want to catch a train.


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