主语从句的虚拟
1. it is + adj. + that sb. (should) do
常见的形容词有：necessary, important, strange, natural
it's important that he take my advice.
2. it is + n. + that sb. (should) do
常见的名词有：a pity, a shame, no wonder, one's wish
it's a pity that he be so silly.
3. it is + done + that sb. (should) do
常见的过去分词有：suggested, advised, demanded, requested, required, asked, ordered,
proposed, decided, desired, insisted等。
it's requested that she go home as soon as possible.
宾语从句的虚拟
1. 表命令，表建议，表要求的动词，后接宾语从句虚拟。虚拟的构成为(should) do。
i advise that he stay at home.
2. wish后接从句，虚拟的构成是往过去推一个时态。
i wish i had watched the football match last night.
注意以下几组词或短语用于虚拟语气中。
1. as if, as though
he speaks english as if he were a native speaker.
2. otherwise, but, even though
he was ill. otherwise he would have been there.
3. with, without, but for
without your help, i would have died two years ago.
but for your help, i would have died two years ago.
4. would rather i'd rather you told me yourself.
5. it's time that
it's time that you went to bed.
it's time that you should go to bed.
表语从句中的虚拟
在表语从句中，表示间接的命令，要求、请求、建议、决定等，主句中的主语通常是suggestion, proposal, request, orders, idea等。从句谓语形式是(should)＋动词原形。如：
his suggestion is that we (should) leave at once.
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