过去本该(不该)做但却没做ought (not) to have done
过去本该(不该)做但却没做(做了)过去本来没必要做但却做了(not) have done宁愿过去做了(没做)注意:must have done都表推测。其区别在于可能性的大小。must have done表很有可能表有可能表可能性很小则为“不可能”。(1)I told Sally how to get here,but perhaps I should have written it out for her.
我告诉过莎莉怎么来这儿不过也许我该写给她的。(2)Sorry,I'm late.I might have turned off the alarm clock and gone back to sleep again.
对不起我迟到了。我可3)I was really anxious about you.You shouldn't have left home without a word.
我真为你担心你不该什么也不说就离家出走的。(4)Tom needn't have got up that early since it was Sunday and he had nothing important to do.
汤姆本来没有必要起那么早的因为是星期天他也没什么重要事情。(5)I would rather not have blamed him because he was a child after all.
我宁愿没有责备他。因为他毕竟只是个孩子。关于should的主要用法。(1)It's already seven o'clock.Jack should be here at any moment.
已经七点钟了杰克随时都可能来的。(should表推测意为“随时都会来”真该来了”)(2)-When can I come for the photos? I need them tomorrow afternoon.我什么时候来拿照片?我明天下午要用。-They should be ready by 12:00.(should:应该)十二点前应该就可以了。(3)You can't imagine that a wellbehaved gentleman should be so rude to a lady.
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