He talks as if he knew where she was.
②与过去事实相反
He talks about Rome as if he had been there before.
③与将来事实相反
He opened his mouth as if he would say something.
in order that/so that引导的状语从句中动词用can/could/may/ might/ would等+do Turn on the light so that we can see it clearly.
宾语从句 demand, suggest, order, insist后接的从句中动词为should+do He suggested that we not change our mind.
wish后的从句中分别用过去式,过去完成式和should/would+do表示与现在,过去和将来情况相反 I wish I could be a pop singer.
I wish I would have gone to Shanghai last month.
主语从句 在It is necessary / important / strange that…
It is suggested / demanded/ ordered / requested that…等从句中,
谓语动词用should+do It is strange that such a person should be our friends.
其它
句型中 It is time that…句型中动词用过去式或should+do It’s high time that we left/should leave.
would rather所接的从句中动词用过去式或者过去完成式 I would rather you stayed at home now.
If only句型中动词常用过去式或者过去完成式,表示强烈的愿望 If only our dream had come true!
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