3．虚拟语气

　　用来表示所说的不是事实，或者是不可能发生的情况，而是一种假设、愿望或建议等。虚拟语气通过谓语动词的特殊形式来表示。

　　If I were a bird，I could fly in the air.

　　如果我是一只小鸟，我就能在空中飞行。

　　二、虚拟条件句的谓语形式

假设情况 if条件从句的谓语形式 主句的谓语形式 与过去事实相反 过去完成式(had＋过去分词) would/should/might/could＋ have ＋过去分词 与现在事实相反 过去式(be的过去式常用were) would/should/might/could＋动词原形 与将来事实相反 ①过去式

②should＋动词原形

③were to＋动词原形 would/should/might/could＋动词原形 　　If he had time now，he would/could/might go with you.(与现在事实相反)

　　要是他现在有时间，他会和你一起去的。

　　If I were you，I would take an umbrella.(与现在事实相反)

　　如果我是你，我会带把伞。

　　If you had come a few minutes earlier，you would/could/might have met the famous singer.(与过去事实相反)

　　如果你早来几分钟，你就会见到那位著名歌手了。

　　If it were to snow this evening，they would not go out.(与将来事实相反)

　　如果今天晚上下雪，他们就不会出去。

　　If he came/should come here tomorrow，I would talk to him.(与将来事实相反)

　　如果他明天来这儿的话，我就会跟他谈谈。

　　[即时演练1]

　　用所给动词的正确形式填空

　　①If my father were(be) here now，he would tell me what to do.

　　②If there were(be) a heavy snow next Sunday，we would not go skating.

③If he had known(know) your address yesterday，he would have visited(visit)