八年级英语语法复习if宾语从句和条件状语从句课件
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（他是否跟我们一起去公园）
2. Ask him _____________________. （他是否能来） whether (if) he can come 3. I don’t know ___________________________.（是否要下雨） whether it is going to rain or not
if （如果）引导的条件状语从句:
用法：
1. 如果主句是祈使句，从句要用一般现在时。 Don’t go and play football if you don’t finish your homework. Please call me if he comes next Sunday.
2. 如果主句是一般将来时， if从句则用一般现在时。 If it raiห้องสมุดไป่ตู้s（从句）， I will stay at home. I’ll go with you if you don’t want to go alone（从句）.
Grammar
语法1：正确使用that, if/whether（是否）, who, why 等疑问词引 导的宾语从句。 语法2：if（如果）引 导的条件状语从句
由从属连词whether, if 引导的宾语从句
e.g. if (whether) he will go to the park with 1. I want to know __________________________________.us
will come 5.I want to know if he _________(come) tomorrow, if
comes he _______(come), I __________(give) the massage will give to him.
summary
if 条件句不一般, 几个要点记心间; 条件句,放在前, 逗号要放句中间。 条件句表可能， 主将从现不一般； 条件句表事实， 主句常用现在时 If还有“是否”意 , 宾语从句放后边
Have a try
用括号内所给词的正确形式填空
1.If the rain _______(stop) tonight, we will go to the stops cinema. 2.I’ll buy a computer if I ______(have) enough money. have won’t get 3.You _________(not get) nervous if you _____(do ) do enough exercise. is won’t argue 4.If she ____ (be) kind to me , I __________(not argue) with her.
与to do 不定式连用只能用whether 4. ____ he will come is not decided.
作主语只能用whether
• 5. How old is he ?( She doesn’t know…)
She doesn’t know how old he is.
• 6. Has he returned to America?(I want to know…) I want to know if he has returned to America. • 7. Can Mike drive a car?(Could you tell us…) Could you tell us if Mike can drive a car? • 8.Did Alice work out the problem by herself? (Please tell me…) Please tell me if Alice worked out the problem by herself.
Fill in the blankets with the proper form
will stay 1.If It______ (rain) tomorrow, I ______(stay) rains at home. 2.You may ______ (pass) the exam if youstudy pass ___ (study) hard. press 3. If you want to record, ________(press) the red light. was 4.He asked us if everybody ____(be) here.
Thank you ,and have a good day.
1.If you want (want) to listen to music,choose ____ _____ (choose) a CD. get 2.If you ___ (buy) a new camera, ____(get) a good buy one. 3.If the lightdoesn’t come (not come) on, wait ___________ ____ (wait) for one minute. 4.If it ___________ (not work) , _____ (wait) a doesn’t work wait minute and then _____(try) again. try 5.If you don’t know (not know) how to use the ________ camera, read (read) the instructions. ____
3.如果主句含有must, may, can 等情态动 词，if从句也要用一般现在时。 If you drive too fast, you may have an accident. You must stop if the traffic is red.
Complete the sentences.
当句末为or not时，引导词只能用whether而不能用if.
If 与whether 的区别
1. I don’t know _____ he will come or not. 与or not 连用只能用whether 2. I don’t care of ______ he is handsome. 介词后只能用whether 3. He wondered ______ to stay here the next week.
2. Ask him _____________________. （他是否能来） whether (if) he can come 3. I don’t know ___________________________.（是否要下雨） whether it is going to rain or not
if （如果）引导的条件状语从句:
用法：
1. 如果主句是祈使句，从句要用一般现在时。 Don’t go and play football if you don’t finish your homework. Please call me if he comes next Sunday.
2. 如果主句是一般将来时， if从句则用一般现在时。 If it raiห้องสมุดไป่ตู้s（从句）， I will stay at home. I’ll go with you if you don’t want to go alone（从句）.
Grammar
语法1：正确使用that, if/whether（是否）, who, why 等疑问词引 导的宾语从句。 语法2：if（如果）引 导的条件状语从句
由从属连词whether, if 引导的宾语从句
e.g. if (whether) he will go to the park with 1. I want to know __________________________________.us
will come 5.I want to know if he _________(come) tomorrow, if
comes he _______(come), I __________(give) the massage will give to him.
summary
if 条件句不一般, 几个要点记心间; 条件句,放在前, 逗号要放句中间。 条件句表可能， 主将从现不一般； 条件句表事实， 主句常用现在时 If还有“是否”意 , 宾语从句放后边
Have a try
用括号内所给词的正确形式填空
1.If the rain _______(stop) tonight, we will go to the stops cinema. 2.I’ll buy a computer if I ______(have) enough money. have won’t get 3.You _________(not get) nervous if you _____(do ) do enough exercise. is won’t argue 4.If she ____ (be) kind to me , I __________(not argue) with her.
与to do 不定式连用只能用whether 4. ____ he will come is not decided.
作主语只能用whether
• 5. How old is he ?( She doesn’t know…)
She doesn’t know how old he is.
• 6. Has he returned to America?(I want to know…) I want to know if he has returned to America. • 7. Can Mike drive a car?(Could you tell us…) Could you tell us if Mike can drive a car? • 8.Did Alice work out the problem by herself? (Please tell me…) Please tell me if Alice worked out the problem by herself.
Fill in the blankets with the proper form
will stay 1.If It______ (rain) tomorrow, I ______(stay) rains at home. 2.You may ______ (pass) the exam if youstudy pass ___ (study) hard. press 3. If you want to record, ________(press) the red light. was 4.He asked us if everybody ____(be) here.
Thank you ,and have a good day.
1.If you want (want) to listen to music,choose ____ _____ (choose) a CD. get 2.If you ___ (buy) a new camera, ____(get) a good buy one. 3.If the lightdoesn’t come (not come) on, wait ___________ ____ (wait) for one minute. 4.If it ___________ (not work) , _____ (wait) a doesn’t work wait minute and then _____(try) again. try 5.If you don’t know (not know) how to use the ________ camera, read (read) the instructions. ____
3.如果主句含有must, may, can 等情态动 词，if从句也要用一般现在时。 If you drive too fast, you may have an accident. You must stop if the traffic is red.
Complete the sentences.
当句末为or not时，引导词只能用whether而不能用if.
If 与whether 的区别
1. I don’t know _____ he will come or not. 与or not 连用只能用whether 2. I don’t care of ______ he is handsome. 介词后只能用whether 3. He wondered ______ to stay here the next week.