If引導(dǎo)的條件狀語從句ppt課件

1、If引導(dǎo)的條件狀語從句,1,語法：,例句：If people obey the traffic rules, there will be fewer accidents.,if引導(dǎo)的條件狀語從句,if:從屬連詞，意思是：“如果，假如，倘若”,從句,主句,There will be fewer accidents if people obey the traffic rules.,原句可改為：,if引導(dǎo)的條件狀語從句既可以放在句子前， 也可以放在句子后。 從句位于主句之前時(shí)，常用逗號(hào)將其與主句隔開。,結(jié)構(gòu)：,2,If it rains tomorrow, I will stay at home.

2、,If you are hard-working, your parents may feel happy.,Study hard, if she wants to get good grades.,主將從現(xiàn)，主情從現(xiàn)主祈從現(xiàn)，,3,if 引導(dǎo)的條件狀語從句和if 引導(dǎo)的賓語從句的區(qū)分:,If 在賓語從句中翻譯為“是否” If 在條件狀語從句中翻譯為“如果”,Ill go to see you if I am free next week.,I want to know if he is a teacher.,whether,1. if 在句中的含義不同,4,2. if 在從句中的位置不同,I

3、f 引導(dǎo)的賓語從句放在主句之后；而if引導(dǎo)的狀語從句可放在主句之前也可放在主句之后,= If it doesnt rain, I will go out tomorrow.,I will go out tomorrow if it doesnt rain.,I dont know if the train has arrived.,5,找出下列句子中哪些是if條件狀語從句，哪些是if賓語從句,1. Can you tell me if she can come to the meeting ? 2. She will not go there if it is rainy tomorrow.

4、3. I cant guess if she will be angry . 4. If we help each other , we both will get good results .,6,3. 時(shí)態(tài)要求上有區(qū)別：口訣,If 引導(dǎo)條件狀語從句的時(shí)態(tài)為一般現(xiàn)在時(shí) 記住“主將從現(xiàn)”,1.I want to know if there a sports meeting next month.,doesnt rain,will be,2.If it , well hold it.,If 引導(dǎo)的賓語從句的時(shí)態(tài)由主句及本身時(shí)態(tài)決定；,If是否，一般將來；if如果，一般現(xiàn)在,7,-Sam, do

5、you know if Alice _to my party next week? -I think she will come if she _ free. A comes; is B will come; will be C will come; is D comes; will be,8,If 引導(dǎo)的條件狀語從句的練習(xí),1 we dont know if it _tomorrow, if it _,we wont go hiking.(snow) The sense of happiness will increase if you _ what you like to do.(do)

6、3 If she _(not get ) up early , shell miss the early bus . 4 be quick, please, or you will be late for school. _you _quick, you will be late for school.,9,1.If you _ to the party, youll have a great time. A. will go B. went C. go D. going 2 I _ her the answer if she _me. A.can tell, will ask B. will tell, will ask C. would tell, ask D. will tell, asks,C,D,3. What are you going to do tomorrow? -Well go to the library tomorrow if it _. A. isnt rain B. rain C. wont rain D. doesnt