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m m
She isn't tired, but he is.
(he is = he is tired)
He likes tea, but she doesn't.
(she doesn't = she doesn't like tea)
In these exam ples, it is no t necessary to repeat som e words ('he is tired', 'she doesn't like t ea ’).
You can use these verbs in the sam e way:
.
am / is/ are
was/ were
have/ has
do/ does/ did
can
will
m ight
m ust
O I haven't got a car; but m y sister has. (= m y sister has got a car)
O a: Please help me.
b: I'm sorry. I can't. (= I can't help yo u)
O a: Are yo u tired?
b: I was, but I'm not now. (= I was tired, but I'm not tired no w )
O a: D o you think Laura will com e and see us?
b: She might. (= she m ight co m e)
CD a: Are yo u g o in g n o w ?
b: Yes, I'm afraid I must. (= I m ust go)
W e don't use 'm/ 's/ 've etc. (sh o r t fo r m s) in this way. You m ust use am / is/ have e t c.:
O She isn't tired, but he is. (n o t but he's)
But you can use isn't / haven't / won't etc. (n egative short form s):
O M y sister has got a car, but I haven't.
O Are you and Jane w orking tom orrow?' 'I am , but Jane isn't.'
You can use I am / I'm not etc. after Yes and No:
O 'Are you tired?' 'Yes, I am. / No, I'm not.'
O 'W ill Alan be here tom orrow?' 'Yes, he will. / No, he won't.'
O 'Is there a bus to the airport?' 'Yes, there is. / No, there isn't.'
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I
W e use do/ does for the p resen t sim p le (—> Units 6- 7 ):
O I don't like ho t weather, but Sue does. (= Sue likes hot w eather)
O Sue w o rks hard, but I don't. (= I don't w o rk hard)
'Do you enjoy yo ur work?'
'Yes, I do.'
W e use did for the p a st sim p le ( —> Unit 12):
O a: Did you and Chris enjoy the film ?
b: I did, but Chris didn't. (= I enjoyed it, but Chris didn't enjoy it)
O 'I had a good time.' 'I did too.' (= I enjoyed it too)
'Did it rain yesterday?'
'No, it didn't.'
90 f have you? / don't you? etc. Unit 41 so am I / neither am I etc. ■ » Unit 42