l Ought to have done
l You ought not to write so carelessly.
l Oughtnt we to give him a chance to try?
Have to 不得不 ,表示客观的必要性。Have to 可以和情态动词连用。如, will have to, 其否定式 dont have to =neednt.
l You dont have to (neednt) say that .
l You mustnt move someone if the person is badly hurt.
l My watch doesnt work. There must be something wrong with it.
1, You ___ return the book now. You can keep it till next week if you like.
A, cant B, mustnt C, neednt D, may not
2, A computer ___ think for itself; it must be told what to do.
A, cant B, couldnt C, may not D, might not
3, Johnny, you ___ play with the knife; you ___ hurt yourself.
A, wont, cant B, mustnt, may C, shouldnt D, cant , should
4,----Should I tell John about it?
---- No ,you ____. Ive told him already.
A, neednt B, wouldnt C, mustnt D, shouldnt
5, Jenny ___ with him at that time, for I was having dinner with her in my home.
A, cant have been B, mustnt have been C, must be D, may be
6, When reading, you____ look up every new word you meet.
A, dont have to B, mustnt C, dont need D, may not
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