李彩鳳的微課12

1、條件狀語從句的用法 巴州和靜縣第一中學 設計者：李彩鳳,條件狀語從句,由引導詞if或unless引導的狀語從句叫做條件狀語從句。在英文中，條件是指某一件事情實現之后（狀語從句中的動作），其它事情（主句中的動作）才能發生，通常譯作“假如”。（注意：在含有條件狀語從句的復合句中，表示將來時態，主句是一般將來時態，從句要用一般現在時, 主將從現原則（主將從現，將并非指將來時，還只表示將來含義的，跟著if后的那句話是從句。）,It will be sunny tomorrow.,Find the rule (1),We will have a picnic tomorrow.,Find the rul

2、e (1),We will have a picnic if its sunny tomorrow.,It will be sunny tomorrow.,We will have a picnic tomorrow.,I will take part in the English competition.,Find the rule (2),Dad will buy a pen for me.,Find the rule (2),Dad will buy a pen for me if I take part in the English competition.,I will take p

3、art in the English competition.,Dad will buy a pen for me.,We will go to the park.,It wont rain tomorrow.,We will go to the park if it doesnt rain tomorrow.,Find the rule (3),if條件狀語從句中，主句用一般將來時，從句用一般現在時表示將來。,If you wont hurry up, you will miss the early bus.,If you dont hurry up, you will miss the e

4、arly bus.,Whats the rule? （1）,If you., you will.,if條件狀語從句中，如果主句有must，can，may等情態動詞，從句用一般現在時。,You must stop if the traffic light is red.,You may go fishing if you are free.,He can go home if he finishes his homework.,Whats the rule? （2）,if條件狀語從句中，如果主句是祈使句，從句用一般現在時。,Let me know if he comes.,Dont wait f

5、or me if I am late.,Put up your hands if you have any questions.,Whats the rule? （3）,2. If條件狀語從句中，如果主句有must，can，may等情態動詞，從句用一般現在時。（主情從現）,3. If條件狀語從句中，如果主句是祈使句，從句用一般現在時。（主祈從現）,1. If條件狀語從句中，主句用一般將來時，從句用一般現在時表示將來。（主將從現）,Rules,3.If Mary (buy) the book, she will use up all her money.,1.If I (be) free, Il

6、l visit my aunt next Sunday.,4.If I (study) hard, Ill win the English competition.,2.If it (be) cold tomorrow, I will wear my sweater.,am,is,buys,study,Exercise (1):,5. If a UFO (land) in front of me, I (go) in to look for the alien.,lands,will go,Exercise (2):,1.Call me if the boss (will come/comes).,comes,2. She must see a dentist if she (has/will have) a toothache.,has,3.Have a good rest if you (will be/are) tired.,are,4.You can go shopping with your sister if you (have/will have) time this afternoon.,have,5.If there (will be/