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1、一、观察下面的句子If you go to the party, you will have a great time.If you do ,you will be late.If you do,you will be sorry.If they have it today,half the classwont come.If we ask people to bring food, they will just bring potato chips and chocolate. 以上几个句子中“if”有相同的含义“如果”，引导条件状语从句逗号后面的 句子是主句。整个连起来的大句子叫主从复合句
2、。注意主句和从句的时态有什么特点。总结:.If.弓导的条件状语从句川一般现在时,主句用二般将来时。他称一“上将丛现二一练习：(1) If you(come)here, you(be) happy.(2) If it(rain) tomorrow, we(not, go) to the park.(3) If he(come) here, I(call) you.(4) If it(not rain), we(have) a picnic野餐).(5) If we do that, more people (want) to play the games.(6) If they that , t
3、he games(be) more exciting, too.(7)What happen if they(have) the party today?(8) What happen 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(finish) my homework. 条件状语从句的引导词还有“ unless除非(否则)，如果不”You wont pass the exam unless youstudy hard.Unless
4、 you deal with (处理)your problems, you will be unhappy.二、同样when可以引导状语从句“主将从现”也适合也就是说：when引导的时间状语从句也是一般现在时，主句也是一般将来时。What are you going to be when yougrow up?What is he going to be when hegrows up?三、“主将从现”的含义扩充主：表示主句将：1r (1)主句是一般将来时, (2)主句是祈使句(3) 主句含有情态动词 can、may、must/have to从：表示状语从句现：表示状语从句是一般现在时例句：(
5、1)Dont go and play football if your homework(not finish).(2)If it(not rain) tomorrow, we(go)to climb the hill.(3)He wont leave until you(agree)with him.(4) You can cross the road when the lights(turn) green.(5)I (call)you as soon as he(tell) me about the good news.(6)The students will go to Summer P
6、alace if it tomorrow.A. dont rain B.wont rain C. doesnt rain D. isnt rain四、if翻译成“是否”，引导宾语从句，时态是：一般将来时。例如： I dont know if. he . will . . come . to.morrow.V.He asks me if I will be free .V.They want to know if they will have a party next week.V.注意把if的两个意思放在一道题中考试。（主将从现宾将）Mary wants to know if Tom will
7、 come . If he comes, I will call Mary.练习：1.I dont know if it tomorrow. If it, well go out for a picnic.A. will rain; doesnt rain B. will rain; rains C. rains ; will rain2.-Does Ted tell you if he next Sunday?-No, he doesnt. But if he. Ill give you a ring.A. will come; will comeB. comes; will comeC.
8、comes ; comesD. will come; comes3. -1 wonder if it tomorrow.-Dont worry.If it, well stay at home.A. rains; rains B. will rain; rains C. rains; will rainif引导的条件状语从句五、含有时间状语从句的主从复合句，常考时态有两种可能:常考的弓I导词 when、 as soon as（就）、not- until-（直到才-）主句 从句when he grows up.1、主将从现(1) He is going to be an engineer主句：一般将来时when引导的时间状语从句一般现在时 I will call youas soon as hecomes here.主句：一般将来时as soon as引导的时间状语从句一般现在时(3) Lwont. go - to 一beduntil I. finish. my. homework.主句：一般将来时until引导的时间状语从句一般现在时2、第二种情况：主句和时间状语从句都是一般过去时态（要过去都过去）I didnt go to work until I finished my homework.我直到完成了作业才上床睡觉。
if引导的条件状语从句
