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ifsong_ifsong领带怎么样_if so

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1. (表示条件)如果 ,主句用将来时，if从句用现在时表示将来

He will come if you invite him. 如果你请他,他会来的。 2. (表示虚拟)假如,要是 1）时态：可以表示过去，现在和将来的情况。它的基本特点是时态退后。 a. 同现在事实相反的假设。 句型 ： 条件从句 主句 一般过去时 should( would) +动词原形 If they were here, they would help you. b. 表示于过去事实相反的假设。 句型： 条件从句 主句 过去完成时 should(would) have+ 过去分词 If she had worked harder, she would have succeeded. The rice would not have been burnt if you had been more careful. If my lawyer had been here last Saturday, he would have prevented me from going. If he had come yesterday, I should / would have told him about it. 含义：He did not come yesterday, so I did not tell him about it. If he had not been ill and missed many classes, he would have made greater progress. 含义： He was ill and missed many lessons, so he did not make greater progress. c. 表示对将来的假想 句型： 条件从句 主句 一般过去时 should+ 动词原形 were+ 不定式 would + 动词原形 should+ 动词原形 If you succeeded, everything would be all right. If you should succeed, everything would be all right. If you were to succeed, everything would be all right. 3. 是否 = whether 连接宾语从句 I wonder if she is ill. 不知她是否病了。

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Examples: 1. Well let you know if any vacancies come up. 一有空缺我们就通知你. 2. If any oil gets on the car tyres, it will perish them. 汽车胎沾上油就会毁坏. 3. Please correct my mistakes if any(=if there is any mistake).如果有的话，请改正我的错误。 if ever: conj. 如果有过的话(如果发生过的话) Examples: 1. That was a fine meal if ever there was one! 那确实是一顿丰盛的饭。 2. She seldom, if ever, goes to the cinema. 她难得看电影. 3. The island is seldom, if ever, visited by ships. 这个岛难得有船停靠.(=if the island has ever been visited by ships) 4. He is a great musician if ever there was one. 如果曾经有过伟大的音乐家，那他就是一个。

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