外研八下Module 5 if 用法（课堂PPT）

1、1If 引导的条件状语从句的复习引导的条件状语从句的复习1 If I _(not understand）, I will ask my teacher for help . If I _(copy ) your homework , I will cheat myself . 3 If she _(not get ) up early , shell miss the early bus .2 4 If your mother_ (buy) the book for you , it will be good for your study. dont understand copy doesn

2、t get buys25. If you _(not work ) hard , you _(not pass) the exam.6. If she _(mend) the computer , her father _(not blame ).7. If your brother _(break) the window , he will feel very sorry for that .8. If the computer (not work), mend it please .dont workwill not mendswill not breaksdoesnt work3找出下列

3、句子中哪些是找出下列句子中哪些是if条件状语从句，条件状语从句，哪些是哪些是if宾语从句宾语从句1. Can you tell me if she can come to the meeting ?2. She will not go there , if it is rainy tomorrow.3. I cant guess if she will be angry .4. If we help each other , we both will get good results . ，4if 引导的条件状语从句和引导的条件状语从句和if 引导的引导的宾语从句的区分宾语从句的区分:If 在

4、宾语从句中翻译为在宾语从句中翻译为“是否是否”If 在条件状语从句中翻译为在条件状语从句中翻译为“如果如果”Ill go to see you if I am free next week. I want to know if he is a teacher.whether1. if 在句中的含义不同在句中的含义不同52. if 在从句中的位置不同在从句中的位置不同If 引导的宾语从句放在主句之后；而引导的宾语从句放在主句之后；而if引导的状语从句可放在主句之前也可放引导的状语从句可放在主句之前也可放在主句之后在主句之后= If it doesnt rain, I will go out to

5、morrow.I will go out tomorrow if it doesnt rain.I dont know if the train has arrived.63. 时态的区别时态的区别If 引导的宾语从句的时态由主句时态定；引导的宾语从句的时态由主句时态定；If 引导条件状语从句的时态为一般现在时，引导条件状语从句的时态为一般现在时， 主句为一般将来时主句为一般将来时 - “主将从现主将从现” I want to know if there a sports meeting next month.If it , well hold it.doesnt rainwill be74. 标点不同标点不同 If 引导的条件状语从句放于句首时多用引导的条件状语从句放于句首时多用逗号隔开；逗号隔开； 而而if引导的宾语从句则不能。引导的宾语从句则不能。81. If she _(not be) interested in math, she will find it very boring .2. If you _(get ) high scores, your parents will be proud of you .3. If you _(be) happy , we will be happy .4. If she (translate ) th