3. 虚拟语气应用于如下结构中: (1)一种定语从句:It’s time that+did (2)两种目的状语从句: so that/in order that+ can/may/could/might +do

(3)三种随时变化句: ①   wish     现在→did/were     if only  + 过去→had done as if/though    将来→could/would do 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: My suggestion is that we (should) hold a class meeting. ④idea, plan以及表示“坚持,命令,建议,要求”等动词的同源名词后的同位语从句要用虚拟语气。例: The office gave an order that his soldiers fight back bravely.

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