if引導(dǎo)的條件狀語從句

1、語法10單元語法再現(xiàn)一、觀察下面的句子If you go to the party, you will have a great time.If you do ,If you do,If they have it today,you will be late.you will be sorry.half the classwon come.If we ask people to bring food, they will just bring potato chips and chocolate.以上幾個句子中“ if”有相同的含義“如果”，引導(dǎo)條件狀語從句逗號后面的 句子是主句。整個連起來的

2、大句子叫主從復(fù)合句。注意主句和從句的時態(tài)有什么特點?？偨Y(jié)：If引導(dǎo)的條件狀語從句用一般現(xiàn)在時主句用一般將來時。一練習(xí)：簡稱“主將從現(xiàn)”(1) If you(come)here, you(be) happy.(2) If it_(ra in) tomorrow, we _(not, go) to the park.(3) If he _(come) here, I _(call) you.(4) If it _(n ot rai n), we _(have) a pic nic野餐).(5) If we do that, more people _(want) to play the games

3、.(6) If they_that , the games _(be) more excit ing, too.(7) What_happe n if they _(have) the party today?(8) What_happe n if they_a video at the party?(9) If he_(take) a taxi, it_(be) too expensive.(10) If I _(go) to the movies, I _(fini sh) my homework.條件狀語從句的引導(dǎo)詞還有“ unl ess除非(否則)，如果不”You won pass t

4、he exam unl ess youstudy hard.if引導(dǎo)的條件狀語從句Uni ess you deal with (處理)your problems, you will be un happy.二、同樣when可以引導(dǎo)狀語從句“主將從現(xiàn)”也適合 也就是說：when引導(dǎo)的時間狀語從句也是一般現(xiàn)在時, 主句也是一般將來時。What are you going to be whe n yougrow up?What is he going to be whe n hegrows up?三、“主將從現(xiàn)”的含義擴充主： 表示主句將： (1)主句是一般將來時V ( 2)主句是祈使句j ( 3)

5、 主句含有情態(tài)動詞 can、may、must/have to從：表示狀語從句現(xiàn)：表示狀語從句是一般現(xiàn)在時例句：(1) D ont go and play football if your homework_(not fini sh).(2) If it _(not rai n) tomorrow, we_(go)to climb thehill.(3) He wont leave un tilyou _(agree)with him.(4) You can cross the road whe n the lights_(tur n) gree n.(5) 1 _(call)you as so

6、on as he_(tell) me about the good n ews.if引導(dǎo)的條件狀語從句(6)_The stude nts will go to Summer Palace if it_tomorrow.A. dont rainB.w ont rain C. does nt rain D. is nt rain四、if翻譯成“是否”，引導(dǎo)賓語從句，時態(tài)是：一般將來時。l don know if he will come tomorrow.V.He asks me if I will be free .V.They want to know if they will have a

7、party next week.V.注意把if的兩個意思放在一道題中考試。(主將從現(xiàn)賓將)Mary wants to know if Tom will come . If he comes, I will call Mary.練習(xí)：1dont know if it_tomorrow. If it_, well go out for a pic nic.A. will rain; does nt rai nB. will rain; rai ns C. rai ns ; will rai n2.-Does Ted tell you if he_next Sun day?-No, he does

8、nt. But if he _. I ll give you a ring.A. will come; will comeB. comes; will comeC. comes ; comesD. will come; comes3. -1 won der if it _tomorrow.-Dont worry. If it _, well stay at home.A. rains; rains B. will rain; rains C. rains; will rainm?？嫉囊龑?dǎo)詞when、as soon as一-就-)、notuntil-(直至U -才-)主句從句1、主將從現(xiàn)(1) He is going to be an engineerwhen he grows up.主句：一般將來時when引導(dǎo)的時間狀語從句一般現(xiàn)在時(2) I will call youas soon as hecomeshere.主句：一般將來時as soon as引導(dǎo)的時間狀語從句一般現(xiàn)在時(3)丄 wongo to _ beduntilLfinishmyhomewp.rk.主句：一般將來時until引導(dǎo)的時間狀語從句一般現(xiàn)在