if条件句课件讲解.pdf

ZERO FIRST SECOND THIRD If clause Main clause Main clause If + Present simple Present simple If I am late for school, If I am late for school, my teacher gets angry. my teacher gets angry. If 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 clause Main clause • If + Present tense will / can / may / must + ver If I go to London, If I go to London, I will see the Big Ben. I will see the Big Ben. If I go to London … I will see the Big Ben. If I go to Buckingham Palace, I can take a photo of the Royal Guard. If you go to London, you must look right before crossing a street If clause Main clause If + Past Simple would / could / might + ver If I were an astronaut, If I were an astronaut, I would travel in a spaceship. I would travel in a spaceship. If I were an astronaut, I would travel in a spaceship. If I travelled in a spaceship, I would go to Mars. If I went to Mars, I would meet a Martian. Nice to meet you! If I met a Martian, I wouldn’t understand him. ? IfI aved If I didn’t understand him, I would come back to the Earth. If clause Main clause If + Past Perfect would/could/might + have + past tense participle If I had studied hard, If I had studied hard, I would have passed my exams. I would have passed my exams.