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2. 虚拟语气用于主语从句
(1) 在句型"It is important (necessary， strange， essential ...) that .... "中，that 后面的从句中的谓语动词用"(should)+ 动词原形"。如：
It’s necessary that you should review your lessons before the examination.
(2) 在句型"It is suggested (requested， proposed， ordered ...) that ... "中，that 后面的从句中的谓语动词用"(should)+ 动词原形"。如：
It’s suggested that we (should) put on a short play at the party.
3. 虚拟语气用于表语从句或同位语从句
advice， idea， order， demand， plan， proposal， suggestion， request等名词后的表语从句和同位语从句中用虚拟语气，谓语动词用"(should)+ 动词原形"。如：
His suggestion that we (should) go fishing is wonderful.
My idea is that we (should) get more people to attend the conference.
4. 以as if / as though引导的方式状语从句或表语从句，有时用虚拟语气
从句表示与现在事实相反，谓语动词用一般过去时；表示与过去事实相反，用had +过去分词；表示将来的可能性不大，用would (might， could) +动词原形。如：
He speaks as if he knew everything about the accident.
The two strangers were talking warmly as though they had been friends for years.
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