Unit 34: HAVE TO/ NEED TO/ NEEDN'T
We use these verbs to talk about necessity.
Formation
HAVE TO/ NEED TO
We can make all verb formations with these verbs. For example:Present simple (Unit 19)
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 (Unit 21)
Did they have to go to work?
Yes, they had to go to work.
I needed to do a number of things, but I didn't have enough time.
Present perfect (Unit 24)
She has had to stay behind to balance the deposit slip.
With modal verbs (Unit 27)
I may have to go and help that customer.
If we want to display these new items, we will need to move those boxes.
NOTICE: We always use base form (Unit 14) after to. We say he had to go (NOT he had to went).
needn't is a modal verb (Unit 27)
EXAMPLE: We needn't finish today.
Use: necessity
GENERAL
EXAMPLES:
Seniors don't usually have to pay full prices on Wednesdays.
You need to show your identification to get the discount.
PRESENT AND FUTURE TIME
EXAMPLES:
I have to find someone to work today.
We can't find someone to work tonight; we'll have to close the store early.
You needn't work a double shift. We'll just close the store early.
PAST TIME
EXAMPLES:
There were no available employees. I had to hire someone new.
The manager said that the staff all had to go for training .
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