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虚拟语气 一． If 型 二． Should+动词原形 三． 类似if 型
一．If 型（主从句在现有时态基础上向前退一个时态） 1. ※if 条件句的虚拟 条件从句 主句 与现在If+主语+were 主语事实相If+主语+Ved +Should/would/could+反 动词原形 与过去If+主语+had 主语事实相done +Should/would/could+ 反 have done sth 与将来If+主语+ved 主语+ 事实相If+主语+should Should/would/could+反 If+主语+were to 动词原形 If it rains tomorrow, it will be fine. Be to do sth
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If John were here now ,he would explain it.
If you had asked me earlier, I would have told you. If it rained/should rain/ were to rain tomorrow, . I would stay at home
※ If 条件句中有were, had, could, should等，可省略if, 将were, had, could, should提到句首，变为倒装。
hadyou asked me earlier, I would have told you.
Had you asked me earlier, I would have told you.
If John were here now ,he would explain it. Were John here now ,he would explain it.
二．Should+动词原形 1.
.
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其后的宾语从句及以其同根名词(suggestion ,advice, proposal, requiremen)引导的主语，表语，同位语从句中用(should)+动词原形。 He suggested that we (should) go home earlier.
His suggestion was that we (should) go home earlier.※区分suggest +(that )+主语+(should) do+sth
Suggest doing sth
He suggested going out for a walk.
He suggested that I should go out for a walk.
※insist / suggest 各有两种意思，要用不同的语气 Insist 表示“坚决要求”时，用虚拟形式 Insist 表示“坚持认为，坚持说”时，用陈述语气，表示事实。
Suggest 表示“建议”时，用虚拟形式。
Suggest 表示“表明、暗示”时，用陈述语气。 e.g. Your pale face suggests that you are ill.
I insisted that you were wrong.
I insisted he should return____(return) the book. 2. It is important (necessary, strange,) that ....
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类似用法的词有：necessary，strange，natural，desired， a pity, a shame, no wonder … e.g. It’s necessary that we should have a walk
三．类似if 型 1.
Wish/as if/as though/ if only/would rather that …
e.g. I wish I were 30 years younger.
He treated the little girl as if she had been he own daughter.
I would rather you had gone there last Sunday. If only I had seen the film yesterday!
2.
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e.g. It’s high time that you went.
It’s high time that you should go.
3. 介词短语引导的虚拟语气
e.g.
If you had not helped us,we wouldn’t have made ....
But for your help, we ___________(make) such rapid progress. Without air, there __would be________ (be) no living things.
Thanks to the brave young man, otherwise, the boy ______________(die).would have died
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