Period Five　Grammar-Unreal conditionals

感知以下句子，完成方框下的小题

1．If I were you，I should try my best to go to college.

2．Were I you，I should try my best to go to college.

3．If he had gone to the party last night，everything would have changed.

4．Had he gone to the party last night，everything would have changed.

5．If it were to be sunny tomorrow，we would go out for a picnic.

6．Were it to be sunny tomorrow，we would go out for a picnic.

1．句1,2表示与现在事实相反的假设。

2．句3,4表示与过去事实相反的假设。

3．句5,6表示与将来事实相反的假设。

4．句1,2；句3,4；句5,6的句意分别相同吗？相同。

5．句2,4,6共同的特点是：省略if后的倒装句。

一、虚拟语气简介

虚拟语气用来表示说话人的主观愿望或假想，所说的是一个条件，不一定是事实，或与事实相反。

在条件句中，只有是非真实条件句时，才用虚拟语气。重要的是通过句子意思，看假设的条件是否能够实现。能够实现的是真实条件句，就不能使用虚拟语气；反之，则是非真实条件句，要使用虚拟语气。

二、虚拟语气中if条件句型

(1)与现在事实相反的虚拟语气

条件句用动词的过去式(be动词一般用were)；主句用"would/could/might/should＋动词原形"。

If I knew Arabic，the Arab would not mistake me.