if条件句讲解及练习0.doc

if条件句讲解及练习含if的真实条件句和虚拟条件句（1）在英语中，语气是动词的一种形式，用来表示说话人的意图或态度。英语的语气有三种：陈述语气（表示所说的话是事实），祈使语气（表示所说的话是请求或命令）和虚拟语气（表示所说的话只是一种主观的愿望或假设或建议等）。如果所表示的条件是真实的，或者完全有可能实现的，叫真实条件句，主句和从句的谓语都用陈述语气。如： If she doesnt hurry up, she will miss the first bus. 如果所表示的条件不可能实现或者实现的可能性很小时，叫非真实条件句，主句和从句的谓语要用虚拟语气。从句主句与现在事实相反过去式（be 用were）would/should/could/might+ do与过去事实相反过去完成式would/should/could/might + have done与将来事实相反should (were to) +动词原形would/should/could/might + doIf I were you, I would not let out the secret. 如果我是你的话，我不会泄露这个秘密的。If I knew his new address, I would tell you.如果我知道他的新地址，我会告诉你的。If he studied harder, he would pass the exam.如果他学习再努力点的话，他会通过考试的。If we had made fuller preparation, we should have won the game. 如果我们做了更充分的准备的话，我们肯定就赢了这场比赛。If you had taken my advice, you wouldnt have been late for the meeting.如果你听了我的建议，你开会就不会迟到了。If she were to/should come, I would tell her the secret.万一她来的话，我会告诉她这个秘密。（2）省略if的虚拟条件句在含有were, had, 或者should 等词的虚拟条件句中，可以省略if, 将were, had或者should这些助动词放在句首。如：Were I you, I would not let out the secret. Had we made fuller preparation, we should have won the game.Had you taken my advice, you wouldnt have been late for the meeting. Should she come, I would tell her the secret.高一语法练习if条件句及虚拟语气一、单项选择1. If I _ where he lived, I _ a note to him.A. know, would have sentB. had known, would have sentC. know, would send D. knew, would have sent2. Mary is ill today. If she _, she _ absent from school.A. were not ill; wouldnt be B. had been ill; wouldnt have beenC. had been ill; should have been D. hadnt been ill; could be3. He acted as if he _ everything in the world.A. knew B. knows C. has known D. wont know4. If you had enough money, what _?A. will you buy B. would you buyC. would you have boughtD. will you have bought5. If Mr. Young _ with justice, he _ such a wrong thing.A. were treated; wouldnt doB. had been treated; wouldnt have doneC. were treated; wouldnt have doneD. had been treated; wouldnt do6. What _ if there _ no light during the day?A. will happen; wasB. would happen; isC. happens; were D. would happen; were7. The spokesman acted that way as if he _ anything about the accident but actually he did.A. doesnt hear B. didnt hear C. havent heard D. hadnt heard8. If it _ not for the fact that you _ ill now, I would surely punish you.A. is; are B. were; were C. were; are D. was; were9. Many Chinese movie stars now have given up their Chinese nationality. If I were them, I _ that.A. shouldnt do B. didnt do C. hadnt done D. wont do10. I want to get back by 5 oclock if _.A. likely B. can C. possible D. probable11. It seems as if it _ already summer now but it is only February.A. is B. was C. were D. had been12. If Henry had not pulled his cap low over his brow, he _ by the pol