Unit 5
Grammar sb 51 +52
Have to / don't have to / can / can't
We can use have to + infinitive, to express obligation (something you have to do).
1.Children have to go to school.
(sometimes 'have got to')
Don't have to means you don't need to do something, but it's fine if you want to do it:
2.I don't have to get up early at the weekend(of course, if I want to get up early, that's fine, but I can stay in bed if I want).
Bay attention:
have to for plural: (I , they , we , you)
has to for singular : (he , she ,it)
AND
Don't have to for plural
Doesn't have to for singular.
3.She doesn't have to clean all the chairs. We need just two.
4. I have to study hard.
5.We don't have to participate in the competetion .
6.Salma has to do her duty.
*Can is an auxiliary verb, a modal auxiliary verb. We use can to:
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3.I can read the whole newspaper.
4.She can speak French and Spain.
5.He can't dance at all until he took lessons.
6.My grandfather can't swim.
*Negative
To form the negative we add "not" after can to form one word: cannot.
We can also contract the negative to form can't. (can't = cannot)
*(can't) : for something is imposible to do it.
