② would rather + 现在/将来→did/were
过去→had done
③ 现在:if+did/were, would+ do
过去:if+had done, would+ have done
将来:did
if+ were to do, would+ do
should do
注意:除了由if引导的虚拟条件句外,还有倒装条件句,即把were、had或should提前;混合时间句,虚实错综句,以及含蓄条件句,即由or, otherwise, with, without, but for来引导的。
(4)四种名词性从句:
①当表语是important, natural, necessary, possible, strange, arranged, decided, demanded, ordered, requested, suggested, surprising, a pity, no woder时,主语从句要用虚拟语气。例:
It's important that we (should) help each other.
②动词一坚持(insist),两命令(command, order),三建议(advise, propose, suggest),四要求(ask, demand, request, require)后的宾语从句要用虚拟语气。例:
He insisted that he (should) be sent to the West.
注:insist(坚持说), suggest(暗示,表明)时,从句应用陈述语气。如:
Her pale face suggested that she was ill.
③idea, plan以及表示"坚持,命令,建议,要求"等动词的同源名词作主语时,表语从句用虚拟语气。例:
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