If 引导的条件状语从句（二）
1. if引导的条件状语从句遵循“主将从现”的原则，即主句用一般将来时，从句用一般现在时表示将来，从句中可以添加时间状语。
eg.1) If she works hard, she will succeed.
2)如果明天下雨，我就不去学校了。
2. if 引导的条件状语从句中，当从句的主语为if或与主句的主语一致，且谓语动词中又含有系动词be时，可以省略从句的主语和系动词be。常见的此类结构有：if necessary, if possible ,if true 等。 eg. 1) He will come if (he is) asked. 2) 必要的话，给我家里打电话吧。
_________________ , ring me at home.
3) 如果可能，和我一起去吧。
3. if 引导的条件状语从句还可与“祈使句+and/or+陈述句”句式进行转换。
e.g. 1) If you work harder, you，ll pass the exam.
= Word harder, _____ you, ll pass the exam.
2) If you don, t hurry up , you, ll miss the train.
= ____________________________________
,
Exs:
一．选择填空
I hear the famous singer xu song may come to Huazhou next month.Really? ______ he comes , my younger sister will be excited.
If
B. Until
C. Unless
D. Before
2. If you _______ get enough exercise , you______ weak.
A. won, t ; will
become
B.don, t ; will
become
C. don,t ; won, t
become
D. won,t ; won, t
become
3. John, work hard ______you will make much progress.
A. or
B. nor
C. but
D. and
4. Hurry up, ______you will miss the plane.
A. and
B. but
C. so
D. or
5. If you work hard, you will ______catch up with other students.
A. are able to
B. can be able to
C. be able to
D. Can
二．完成句子
快点，那么你就能赶上最后一班车。
Hurry up, and you _______________ catch the first bus.
=____________________________________________________________________
如果她拒绝收这张支票，我会用现金付款。
If she __________________________________ the check, I will pay cash.
She’ll be very fat if she _____________________(吃得太多）.
Her parents ___________________（会担心) if she doesn’t return home.
三．完成金榜学案——语法探究及探究总结（p28）