A 当说话人对某种设想是否合理或正当提出疑问时,可把
should用于 can t think why/dont know why/see no reason why:等后面:
I dont know why you should think that I did it.
我真不知道你凭什么竟会认为这件事是我干的。
I see no reason why you should interfere in their quarrel.
我不明白你有什么理由竟然会介入他们的争吵。
当这种设想与过去的事情有关时则用完成式:
I cant think why he should have said that it was my fault.
我真不明白他怎么能说这是我的过错。
B 作为一种惯用表达法,should与 what,where,who连用以形象生动地表达惊奇的感情:
What should I find but an enormous spider!
怎么也想不到我看见的竟是一只巨大的蜘蛛!
这种惊奇经常掺杂着令人为难的因素:
Who should come in but his first wife!
怎么也想不到进来的竟是他的前妻!
C should用在 lest后面,有时也用在 in case后面:
1 在书面语中,lestshould结构有时放在表示惧怕或担心的词后面:
He was terrified lest he should slip on the icy rocks.
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2016-02-29
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