Unit 21 Human Biology

Lesson 1 Super Athletes

Grammar : Conditionals Revision

1．条件句有两类，一类是真实条件句，一类是虚拟条件句。

2．如果假设的情况是有可能发生的，就是真实条件句（Zero conditional）。真实条件句中的谓语用陈述语气。

Eg。If it doesn't rain tomorrow, we will go to the par.

　　　如果明天不下雨,我们就去公园.

3.如果假设的情况是过去或现在都不存在的,或将来不大可能发生的,则是虚假条件句,共有三种情况.

Eg. If he had seen you yesterday, he would have asked you about it.

如果他昨天见到你,他会问你这件事的.(事实上他昨天没有见到你,因此也未能问你这件事.)

4.在含有虚拟条件句的复合句中,主句和从句的谓语都要用虚拟语气.虚拟条件从句和主句的动词形式列表如下:

时间 从句 主句 与现在事实相反 动词过去式(be动词的过去式一般用were) would(should/could/might)+动词原形 与过去事实相反 Had+过去分词 would(should/could/might)+had过去分词 与将来事实相反 动词过去式/should+动词原形

were to+动词原形 would(should/could/might)+动词原形 5.虚拟条件句的用法

1) 表示与现在事实相反的假设和结果(1st conditional)

Eg. If I were you,I should/could/would/might tell him the truth.

如果我是你,我就会/可能对他说实话.

If he had time, he would/could/might go with you.

如果他有时间,他就会/可能和你一起去.

If my brother were here,everything would be all right.