（2）Find rules

　　T: What will you do if it rains tomorrow/your friend islate/you lose your watch/your teacher gives you more homework

　　S:I will call him/her if my friend is late.

　　 主句 从句

　　（教师结合前面的歌曲，自然问答后引入关键句型。）

　　T: Let's find the rules!

　　S:

　　If I ______ (go) to the party , I ________ (have) a great time.

　　If I ________ (have) a lot of money, I _________ (help) others.

　　If she_______ (open ) the box, she _______ (find) a teddy bear.

　　T: If 引导的条状语从句中，当主句_________________时，从句用_____________, if 解释为"_____________"这就是 主将从现规律。

　　（教师引导学生总结规律，并简化要点，帮助学生从练习中提炼要点，并回到练习当中去。）

　　（3）

　　（4）Read some typical sentences.

　　T: Readtogether!

　　S:IfI get up at 9:00, I will be late.

　　If I am late, my friend will be angry withme.

　　If my friend is angry with me, I will be sad.

　　If you go, you will have a good time.

If you do, you will be happy.