高三英语一轮复习if引导的条件句课件.pptx

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1、高中英语语法 if引导的条件句由if引导的条件状语从句表示在某种条件下某事很可能发生。1.If you ask him,he will help you.如果你请他帮忙，他会帮你的。2.If you fail in the exam,you will let him down.如果你考试不及格，你会让他失望的if引导的条件状语从句既可以将从句放前面也可以将从句放后面（如果天下雨，我们就不玩了）If it rains,we will stop playing.转为We will stop playing if it rains.if从句还表示不可实现的条件或根本不可能存在的条件（虚拟或假设）从句

2、多用一般过去时或过去完成时。If I were you,I would invite him to the party.如果我是你，我会邀请他参加聚会。I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车，我会到的早一点儿。分分级练习级练习Are you ready?Are you ready?FIRSTSECONDTHIRDZEROIf I am late for school,my teacher gets angry.If clauseMain clauseMain clauseI

3、f+Present simplePresent simpleIf I oversleep I miss the bus.If I miss the bus,I am late for school.If I am late for school,my teacher gets angry.If I go to London,I will see the Big Ben.If clauseMain clauseIf+Present tensewill/can/may/must+verbIf I go to London I will see the Big Ben.If I go to Buck

4、ingham Palace,I can take a photo of the Royal Guard.If you go to London,you must look right before crossing a streetIf clauseMain clauseIf+Past Simplewould/could/might+verbIf I were an astronaut,I would travel in a spaceship.If I were an astronaut,I would travel in a spaceship.If I travelled in a sp

5、aceship,I would go to Mars.Nice to meet you!If I went to Mars,I would meet a Martian.If I met a Martian,I wouldnt understand him.?IfI IfI avedavedIf I didnt understand him,I would come back to the Earth.If I had studied hard,I would have passed my exams.If clauseMain clauseIf+Past Perfect tensewould/could/might+have+past participleIIf you had studied hard,you wouldnt have failed your exam.IIf you had passed your exam,you could have gone to the beach.IIf I had gone to the beach,I would have made sand castles.