A 对现在事件的否定推断,可以用cant或couldnt加上动词be的现在式或者可以用cant/couldnt加上动词的进行式表示:
Child:Can I have some sweets?Im hungry.
孩子:我可以吃些糖果吗?我饿了。
Mother:You cant/couldnt be hungry.Youve just had dinner.
母亲:你不会饿的。你刚吃过饭。
Ann(looking through binoculars):An aeroplane is pulling up people fromthe boat!
安(透过望远镜):有一架飞机正把人们从小船吊到飞机上!
Tom:It cant/couldnt be an aeroplane.It must be a helicopter.
汤姆:不可能是一架飞机。一定是一架直升机。
He says hes still reading The Turn of the Screw.
He cant/couldnt still be reading it.I lent it to him ages ago and its quite a short book.
他说他还在读《螺丝在拧紧》。
他不可能还在读那本书。我很久以前就把书借给他了,而且书也很薄。
B 对过去事件的否定推断,可以由cant/couldnt+动词的完成式或完成进行式表示:
A man answered the phone.I suppose it was her husband.
It cant/couldnt have been her husband.Hes been deaf for ages.
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2016-02-29
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