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透析英语重难点语法:非真实条件句

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发表于 2016-7-9 17:42:09 | 显示全部楼层 |阅读模式
  1)虚拟语气可以表示过去,现在和将来的情况,时态的基本特点是时态往后推移。
          a. 与现在事实相反的假设
          条件从句  主句  一般过去时(be用were)  should(would)等 +动词原形
          例如:If they were here, they would help you. 如果他们在这儿,会帮助你的。
          含义:They are not here, they can‘t help you.
          b. 与过去事实相反的假设
          条件从句  主句  过去完成时  should(would)等+ have+ 过去分词
          例如:If he had come yesterday, I should / would have told him about
it.如果他昨天来的话,我会把这件事告诉他的。
          含义:He did not come yesterday, so I did not tell him about it.
          c. 表示对将来不大可能发生的事情的假想
          条件从句  主句  一般过去时  should/would等 + 动词原形  were+ 不定式  should+ 动词原形
          例如:If you succeeded, everything would be all right. 如果你将来成功了,一切都会好的。
          If you should succeed, everything would be all right.
          If you were to succeed, everything would be all right.
          含义:You are not likely to succeed, everything will be what it is now.
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