被动语态

助动词be + 及物动词的过去分词

含有情态动词：情态动词+ be + 及物动词的过去分辞

短语动词 ：example takes good care >> taken good care

虚拟语气

用来表示非真实的假设，表示命令、建议或说话人的主观愿望

条件从句 主句

违背现在事实 过去式 should / would / could / might + 动词原形

If the manager were here ， he might make a decision immediately

违背过去事实 had + 过去分词 should / would / could / might + have + 过去分词

I could have done it better if I had been more careful

违背将来事实 should + 动词原形 should / would / could / might + 动词原形

were + 动词不定式（ were to + 动词原形）

If it should rain tomorrow ， what could we do ？

在下列结构的主语从句中，谓语动词用虚拟语气

It is necessary / imperative / important / essential / advisable that

It is proposed / desired / requested / suggested / recommended / demanded / decided / arranged that

混合虚拟句 条件从句表示的动作和主句表示的动作，在时间上不一致，动词形式需要调整

If you had taken the medicine yesterday ， you would be well now.

Suggest ， order ， ask ， demand ， command ， request ， require etc.这些动词的宾语从句用虚拟句， 在这些动词后面的宾语从句中，助动词一律是should .

It is （ It was ） important ，其后的主语从句用虚拟语气，助动词用should .

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