1、1Unit 10 Ive had this bike for three yearsif 引导的条件状语从句1If you wear jeans to the party, the teachers wont let you in.2If we watch a video at the party, some students will be bored.3If you work really hard, youll be famous.4If you become a soccer player, youll never go to college.5If I dont do this no
2、w, Ill never do it.一、含义在句子中作条件状语的从句被称为条件状语从句。引导条件状语从句的连接词有 if, unless(除非，如果不), as long as(只要)等，这里只讲解 if 引导的条件状语从句。二、用法if 条件句的主句和从句的时态搭配一般有下面几种情况：1主句是_，if 从句用_。If he runs, hell get there in time.如果跑的话，他就会及时赶到那儿。I will tell her the answer if she asks me.如果她问我，我就会告诉她答案。2主句是含有 may/might/can/must/should
3、等情态动词的句子，if 从句用一般现在时。If it stops snowing, we can go out. 如果雪停了，我们就可以出去。If you want to lose weight, you must/should eat less bread.如果想减肥，你必须/应该少吃面包。3.主句是祈使句，if 从句用一般现在时。Dont go to play football if you dont finish your homework.如果你没完成作业，就不要去踢足球。三、注意1if 还可以引导虚拟条件句，表示不可能实现的条件，从句中多用一般过去时或过去完成时。What would happen if there were no water? 如果没有水会怎样？2if 还可以译为“是否” ，用来引导宾语从句。此时 if 和 whether 是同义词，可以互换。但如果句中有 or not，只能用 whether。She asked me if/whether I knew Mike.2她问我是否认识迈克。I wonder whether he will come to my party or not. 我想知道他是否会来参加我的聚会。3详解详析【语法探究】二、1.一般将来时； 一般现在时
