4.1.1 Dar razones que sustenten esas necesidades
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We use these verbs to talk about necessity.
1 Formation a) have to / need to We can make all verb formations with these verbs. For example:
Present simple He has to work nine hours a day, but he doesn’t have to work very hard. Let’s stop. We don’t need to finish today. Past simple Did they have to go out? Yes, they had to go to the airport. I needed to buy a number of things, but I didn’t have enough money. Present perfect She has had to stay behind to look after the children.
With modal verbs I may have to go to Winnipeg soon. If she takes that job, they will need to move to another city.
NOTICE: We always use base form after to. We say he had to go (NOT he had to went).
b) needn’t is a modal verb. We needn’t finish today.
2 Use: necessity a) general Students don’t usually have to pay tax. You need to get a visa before you travel.
b) present and future time I have to finish this report today. We can’t find a babysitter; we’ll have to stay in tonight. You needn’t write it now. You can do it later.
NOTICE: We also use have got to for present and future necessity.
c) past time There were no buses. I had to get a taxi. He said that they had to go.
NOTICE: The meanings of have to, need to and needn’t are not exactly the same. To learn more about the modals need to/ have to/ must
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