八年级英语语法复习if宾语从句和条件状语从句课件

1、Grammar语法语法1：正确使用正确使用that, if/whether（是否）（是否）, who, why 等疑问词引等疑问词引导的宾语从句。导的宾语从句。语法语法2：if（如果）引（如果）引导的条件状语从句导的条件状语从句 什么是宾语从句？什么是宾语从句？在复合句中做宾语成分的句子叫宾语从句。在复合句中做宾语成分的句子叫宾语从句。 宾语从句的分类、引导词和语序宾语从句的分类、引导词和语序原句式原句式引导词引导词从句语序从句语序陈述句陈述句一般一般疑问句疑问句特殊特殊疑问句疑问句that不变不变whether/if改为陈述句改为陈述句 语序语序 特殊特殊 疑问词疑问词改为陈述句改为陈述句

2、语序语序 宾语从句的时态宾语从句的时态主句主句从句从句一般一般现在时现在时保留原来句子的时态保留原来句子的时态或根据实际情况而定或根据实际情况而定一般一般过去时过去时一般现在时一般现在时 一般过去时一般过去时现在进行时现在进行时 过去进行时过去进行时一般将来时一般将来时 过去将来时过去将来时现在完成时现在完成时 过去完成时过去完成时任一时态任一时态若表客观事实、普遍真理及自然现象用若表客观事实、普遍真理及自然现象用一般现在时一般现在时注：that 在句中无词汇意义，在从句中不能充当成分，在口语当中往往省略e.g. 1. I hear (that) _. （一小时后他会回来）一小时后他会回来）2

3、. He said (that) _. （他非常想念我们）他非常想念我们）3. The teacher told us (that) _. （地球围着太阳转）地球围着太阳转） he will be back in an hour he missed us very much the earth moves around the sun注意：当从句是客观真理的时候，无论主句什么时态，从注意：当从句是客观真理的时候，无论主句什么时态，从句一律用一般现在时句一律用一般现在时由从属连词由从属连词whether, if 引导的宾语从句引导的宾语从句e.g. 1. I want to know _. （他

4、是否跟我们一起去公园）他是否跟我们一起去公园）2. Ask him _. （他是否能来）他是否能来）3. I dont know _.（是否要下雨）是否要下雨） if (whether) he will go to the park with us whether (if) he can come whether it is going to rain or not当句末为当句末为or not时，引导词只能用时，引导词只能用whether而不能用而不能用if.If 与whether 的区别1. I dont know _ he will come or not.2. I dont care o

5、f _ he is handsome.3. He wondered _ to stay here the next week.4. _ he will come is not decided. 与与or not 连用只能用连用只能用whether介词后只能用介词后只能用whether与与to do 不定式连用只能用不定式连用只能用whether作主语只能用作主语只能用whether由连接代词由连接代词what, whom, whose, which, what及连接及连接副词副词 when, where, how, why引导的宾语从句引导的宾语从句when well have a meeti

6、ngwhere he ishow I can get to the stationwhy the train is latewho could answer the questionwhose handwriting was the best in the class1. He asked _. (谁能回答这个问题谁能回答这个问题）2. Do you know_. （他们在等谁他们在等谁）3. He asked _. （谁的书法是班上最好的谁的书法是班上最好的）4. Please tell me _. （我们什么时候开会我们什么时候开会）5. Can you tell me _. （他在哪儿他

7、在哪儿）6. Could you tell me _. （我该怎么去车站我该怎么去车站）7. Would you tell me _（为什么火车迟到了为什么火车迟到了） whom they are waiting for把下列句子连成带宾从的复合句：1.You sucked your finger again. ( I hear .) 2.They will go shopping tomorrow.(He told me). 3.Whose bike is this? (Does anyone know)4. Who went fishing yesterday?(He asked)I he

8、ar that you sucked your finger again.Does anyone know whose bike this is?He told me that they would go shopping tomorrow.He asked who went fishing yesterday. 5. How old is he ?( She doesnt know) 6. Has he returned to America?(I want to know) 7. Can Mike drive a car?(Could you tell us) 8.Did Alice wo

9、rk out the problem by herself? (Please tell me)She doesnt know how old he is.I want to know if he has returned to America.Could you tell us if Mike can drive a car?Please tell me if Alice worked out the problem by herself.用法：1. 如果主句是祈使句，从句要用一般现在时。如果主句是祈使句，从句要用一般现在时。 Dont go and play football if you

10、dont finish your homework. Please call me if he comes next Sunday.if （如果）（如果）引导的条件状语从句引导的条件状语从句:2. 如果主句是一般将来时，如果主句是一般将来时， if从句则用一般现在时。从句则用一般现在时。 If it rains（从句）， I will stay at home. Ill go with you if you dont want to go alone（从句）. 3.如果主句含有如果主句含有must, may, can 等情态动等情态动 词，词，if从句也要用一般现在时。从句也要用一般现在时。

11、If you drive too fast, you may have an accident. You must stop if the traffic is red.1.If you _ (want) to listen to music, _ (choose) a CD.2.If you _ (buy) a new camera, _(get) a good one.3.If the light _ (not come) on, _ (wait) for one minute.4.If it _ (not work) , _ (wait) a minute and then _(try)

12、 again.5.If you _ (not know) how to use the camera, _ (read) the instructions.wantchoosebuygetdoesnt comewaitdoesnt workwaittrydont knowreadComplete the sentences. 2.You may _ (pass) the exam if you _ (study) hard. 4.He asked us if everybody _(be) here. rainswill stay passstudywas 3. If you want to

13、record, _(press) the red light.press1.If It_ (rain) tomorrow, I _(stay) at home.Fill in the blankets with the proper form 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 cinema.2.Ill buy a computer if I _(have) enough money.3.You _(not get) nervous if you _(do ) enough exercise.4.If she _ (be) kind to me , I _(not argue) with her.5.I want to know if he _(come) tomorrow, if he _(come), I _(give) the massage to him. stopshave wont getdo iswont argue will co