IV.虚拟语气用在同位语从句中。
某些表示建议、请求、命令等主观意向的名词后同位语从句需用虚拟语气,其表达形式为(should) +动词原形。
这类名词常见的有:advice,suggestion,proposal(提议),order, demand,desire,request,requirement,recommendation(推荐),plan,resolution(决议), idea等。
eg. We are all for your proposal that the discussion ( should )be put off.
V. 虚拟语气用在表语从句中。
某些表示建议、请求、命令等主观意向的名词作主语时,表语从句需用虚拟语气,其表达形式为(should) +动词原形。
这类名词常见的有:advice,suggestion,proposal,order, demand,desire,request,requirement,recommendation以及plan,idea,resolution等。
eg. My suggestion is that the mayor (should)present the prizes.
VI. 虚拟语气用在定语从句中
It is(about /high)time +that sb.did sth/should do sth..
eg. Don't you think it's about time we went home?
注:在this is the first time /second time that...句型中,从句中谓语动词用陈述语气完成时态。
eg.Is this the first time that you have visited Hongkong?
VII. 虚拟语气用在让步、方式、目的状语从句中
1.在带有even if/ even though引导的让步状语从句的主从复合句中,主句和从句都用虚拟语气,动词形式与含有非真实条件句的虚拟语气相同。
如: Even if he had been ill, he would have gone to his office.
2.由as if或as though引导的状语从句表示比较或方式时。从句谓语形式为动词的过去式(be用were)或 “had十过去分词”。如: He treated me as if I were a stranger.
She talked about the film as if she had really seen it.
3.虚拟语气用在lest(唯恐、免得),for fear that及in case引导的目的状语从句中。 在由lest等引导的目的状语从句中需用虚拟语气,表示“以防,以免”等意思,其谓语动词多由should +动词原形构成,should也可省略。
eg. He was punished lest he should make the same mistake again.
VIII.虚拟语气用情感语言中
1.虚拟语气在表示客气、遗憾以及祝愿等场合中,使用虚拟语气。
eg.You shouldn't have been following him so closely;you should have kept your distance.
2.If only sb./sth. +时态后退型的谓语eg. If only I had known the result of the examination.
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