1、If If 引导的条件状语从句引导的条件状语从句If you miss my party,you will be sorry.从句从句主句主句If引导的引导的条件状语条件状语表示主句动作发生的表示主句动作发生的条件条件，If 释为释为“如果如果”。You will be sorry if you miss my party.注意：主从句的顺序可以调换。注意：主从句的顺序可以调换。if:如果，引导条件状语从句主句主句从句从句例句例句一般将来时一般将来时(will+do)一般现在时一般现在时If he doesnt work hard,he will fail his exams.祈使句祈使句一般
2、现在时一般现在时If you want to go,tell me.情态动词情态动词+动原动原一般现在时一般现在时If she arrives in time,she may come with us.过去将来时过去将来时would+do一般过去时一般过去时If he didnt work hard,he would fail his exams.(主将从现主将从现)(主祈从现主祈从现)注意注意主句时态主句时态从句的时态从句的时态 If 引导的从句是一个完整的句子，一定要有主语引导的从句是一个完整的句子，一定要有主语if 引导的条件状语从句如果你起床晚，你就会迟到。如果你起床晚，你就会迟到。2
3、.if 和条件句位置灵活，可放在句首，也可直接放在主句后面。和条件句位置灵活，可放在句首，也可直接放在主句后面。若若 if 条件句放句首，从句后面要加逗号，和主句隔开。条件句放句首，从句后面要加逗号，和主句隔开。Print the text if you like it.If you get up late,you will be late.=If you like the text,print it.If you want to turn on the recorder,press button A.A B C DEFPress button A if you want to turn on
4、 the recorder.IIpausestopplay fast play backplayrecord-If you want to play，If you want to play back,If you want to record,-How do I play/play back/record/?press the button.press the red button.press the blue button./in the librarykeep quietread books/If you want to read books in the library,keep qui
5、et.Join the sentences with“If”your hands/put up/answer the question If you want to answer the question,put up your hands.If 引导的条件状语从句，引导的条件状语从句，主句主句是是祈使句祈使句，从句从句用用一般现在时态一般现在时态。“主祈从现”Complete the sentences.1.If you _(want)to listen to music,_(choose)a CD.2.If you _(buy)a new camera,_(get)a good one.3
6、.If the light _(not come)on,_(wait)for one minute.4.If it _(not work),_(wait)a minute and then _(try)again.5.If you _(not know)how to use the camera,_(read)the instructions.wantchoosebuygetdoesnt comewaitwaitdoesnt worktrydont knowreadIf I have a robot,_ _ _ If he plays computer games on weekdays,_h
7、e will not get good grades.he will be very tired in class.his parents will be sad.I fought with my best friend.What will you do if you have a lot of pocket money?If I have a lot of pocket money,I will _._.pocket moneyhelp poor childrenput the money in the piggy bank.If I do,I will _.help poor childr
8、en1.Im sure if he _(go)to the party,he _(have)a great time.2.If the rain _(stop)tonight,we will go to the cinema.3.Ill buy a computer if I _(have)enough money.4.You _(not get)nervous if you _(do)enough exercise.5.If she _(be)kind to me,I _(not argue)with her.6.If you work really hard,you _(be)famous
9、 and rich.7.If you _(pay)more attention to that,he _(not get)injured.goeswill havestopshavewont getdoiswont arguewill be paywont getComplete the sentences.If 引导的引导的条件状语从句条件状语从句If 引导的引导的宾语从句宾语从句If 引导的条件状语从句中，if是个从属连词，引导的句子是主句动作发生的条件，一般与后面的句子用逗号隔开，译为：如果如果 If 引导的宾语从句就是在复合句中作宾语的名词性从句，通常放在主句谓语动词（及物动词）或介词
10、之后，译为：是否是否1.I dont know if it _(rain)tomorrow.If it _(rain),we wont have a picnic.2.I want to know if he _(come)tomorrow.If he _(come),I _(give)him a call.3.Please let us know if he _(arrive)tomorrow.Please let us know if he _(arrive)tomorrow.will rainrainswill comecomeswill givewill arrivearrivesPractice
