八年级英语语法复习if宾语从句和条件状语从句课件(1(精)

1、Grammar7if（如果）弓 I语法 1：正确使用十 hatif/whether （是否）；who, why 等疑问词引导的宾语从句。语法 2 导的条件状语从句豹什么是宾语从句？在复合句中做宾语成分的句子叫宾语从句。豹宾语从句的分类、引导词和语序原句式引导词从句语序陈述句that不变一般 疑问句whether/if改为陈述句语序特殊 疑问句特殊 疑问词改为陈述句语序倉宾语从句的时态主句从句一般 现在时保留原来句子的时态 或根据实际情况而定一般 过去时一般现在时 f 一般过去时 现在进行时 f 过去进行时 般将来时 f 过去将来时 现在完成时 f过去完成时任一时态若表客观事实、普遍真理及自然现

2、象用 乞带：一般现在时注：that A句中无词汇意义，在从句中不能充当成分, 在 o 语当中往往石略巳 g g 1.I har （that） he will be back in an hour （一小时后他会回来）2.He said （that） he missed us very much.（他非常想念我们）3 The teacher told us （that） the eailh moves around the sun（地球围着太阳转）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由从属连词whether, if引导的宾语从句e.g.e.g.1.1 want t

3、o know if （whether） he will go to the park with us（他是否跟我们一起去公园）2 Ask him 卫 heiher_（iO_hexan_came （他是否能来）3 I dont know whether it isto rain or noK 是否要下雨）当句末为 o onotnot 时，弓 I I 导词只能用 whethewhethe而不能用 if.if.If与whether的区别1.I dont know_ he will come or not.与 or not 连用只能用 whether2.I dont care of_ he is ha

4、ndsome.介词后只能用 whether3 He wondered_to stay here the next week.与 to do 不定式连用只能用 whether4 _ he will come is not decided 作主语只能用 whether由连接代词what, whom, whose, which, what及连接 副词when, where, how, why引导的宾语从句|1. Hewho could answeZhe quEio*锻能回箱这个问题）2. Do von know whom they are waiting for .（砲们农孑谁）3. He aske

5、d whose handwritin 只 was the best in the class_.（谁的有决是班上最好的）4 PT 诃 1 me when we ll Zve a noting （我幻什么对候开会）5. Can you tell me 缺“ he is .（他衣呷儿）6. Could you tell me ho 1 can 供 t to the statipii（我该怎么去车北）7. Would you tell me *hy the trnin is late （为什么大车迟时 了）把下列句子连成带宾从的复合句：1.You sucked your finger again.

6、(I hear .)I hear that you sucked your finger again.2. They will go shopping tomorrow.(He told me.).He told me that they would go shopping tomorrow.3. Whose bike is this? (Does anyone know.)Does anyone know whose bike this is?4. Who went fishing yesterday?(He asked.)He asked who went fishing yesterda

7、y. 5. How old is he ?( She doesnt know.)She doesnt know how old he is. 6. Has he returned to America?(l 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?(Pleas

8、e tell me.)Please tell me if Alice worked out the problem by herself.if （如果）引导的条件状语从句:用法:1.1.如果主句是祈使句，从句要用一般现在时 C CDont go and play football if you dont finishyour homeworkPlease call me if he comes next Sunday.2.2.如果主句是一般将来时，ifif 从句则用一般现在时。If i十rains（从句）,I will stay at home.Ill go with you if you d

9、ont want to go alone（从句）3 3如果主句含有 must,must, may,may, c c；i i 等情态动 词，ifif 从句也要用一般现在时。If you drive too fast, you cna have anacciden十.遽篦You must stop if the traffic is red Complete the sentences.1f you want (want) to listen to music,choose (choose)a CD.2f you huy(buy) a new camera, get (get) a good on

10、e.3.If the lightdoesrYt come(not come) on, wait (wait) forone minute.4.If it does nt worj(not work) , wait- (wait) a minute andthen try (try) again.5.If you dont know (not know) howTo use the camera,(read) the instructionsFill in the blankets with the proper form1.IfItrains(rain) tomorrow, Iwillsta(

11、stav) athome.2.You maypass(pass) the exam ifyoustudy(study) hard 3 I you want to record, Press(press) the redlight.4.He asked us if everybodywas(be) here Have a try用扌舌号内所给词的正确形式填空1 .If the rain stops (stop) tonight, we will go to the cinema.2ll buy a computer if I have (have) enough money.3.You wont qet (not get) nervous if you do (do ) enoughexercise.4f she is (be) kind to me , I wont argue (not argue) with her.5want to know if he will come (come) to