李彩凤的微课12

1、条件状语从句的用法 巴州和静县第一中学 设计者：李彩凤,条件状语从句,由引导词if或unless引导的状语从句叫做条件状语从句。在英文中，条件是指某一件事情实现之后（状语从句中的动作），其它事情（主句中的动作）才能发生，通常译作“假如”。（注意：在含有条件状语从句的复合句中，表示将来时态，主句是一般将来时态，从句要用一般现在时, 主将从现原则（主将从现，将并非指将来时，还只表示将来含义的，跟着if后的那句话是从句。）,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条件状语从句中，主句用一般将来时，从句用一般现在时表示将来。,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条件状语从句中，如果主句有must，can，may等情态动词，从句用一般现在时。,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条件状语从句中，如果主句是祈使句，从句用一般现在时。,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条件状语从句中，如果主句有must，can，may等情态动词，从句用一般现在时。（主情从现）,3. If条件状语从句中，如果主句是祈使句，从句用一般现在时。（主祈从现）,1. If条件状语从句中，主句用一般将来时，从句用一般现在时表示将来。（主将从现）,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/