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1、FIRSTSECONDTHIRDZERO1If I am late for school, my teacher gets angry.If clauseMain clauseMain clauseIf + Present simplePresent simple2If I oversleep 309/08/2024I miss the bus.409/08/2024If I miss the bus, I am late for school.509/08/2024If I am late for school, my teacher gets angry.609/08/2024If I g
2、o to London, I will see the Big Ben.If clauseMain clauseIf + Present tensewill / can / may / must + verb7If I go to London 809/08/2024I will see the Big Ben.909/08/2024If I go to Buckingham Palace, I can take a photo of the Royal Guard.1009/08/2024If you go to London, you must look right before cros
3、sing a street1109/08/2024If clauseMain clauseIf + Past Simplewould / could / might + verbIf I were an astronaut, I would travel in a spaceship.12If I were an astronaut, I would travel in a spaceship.13If I travelled in a spaceship, I would go to Mars.14Nice to meet you!If I went to Mars, I would mee
4、t a Martian.15If I met a Martian, I wouldnt understand him.?IfI IfI avedaved16If I didnt understand him, I would come back to the Earth.17If I had studied hard, I would have passed my exams.If clauseMain clauseIf + Past Perfect tensewould/could/might + have + past participle18IIf you had studied hard, you wouldnt have failed your exam.19 IIf you had passed your exam, you could have gone to the beach.20 IIf I had gone to the beach, I would have made sand castles.21
