2011英语四级语法讲义大全：虚拟语气二

注意问题：

1、If条件句中绝对不可出现“would”。
2、根据句中的时间状语，有时可能出现“混合虚拟”的情况，即主句可能是现在的情况，条件句也许是发生在过去的情况，但都是遵守上述句型。

3、在条件句中如果出现were, had, should可省去if，将主语与这些词倒装，例如：
Had the doctor come last night, the boy would have saved.

Were I to go to the moon one day, I would see it with my own eyes.

Should it rain tomorrow, we would stay at home.

二、名词性虚拟语气：

在表示命令、建议要求、惊叹时的名词性从句中需用虚拟语气，基本句型：主语＋（should）＋动词原形，如：Mother insisted that John go to bed at 9 o’clock.（宾语从句）

We suggested that the meeting should not be held.

It was required that the crops should be harvested at once.（主语从句）

The suggestion that he be invited was rejected.（同位语从句）

That is their demand that their wages be increased.（表语从句）

注意：在这种句子中绝不出现“would”“must”“could”等。