zh-CNiwms.net pic/logo.gif http://www.enun.cn Wed, 02 Jul 2008 14:16:35 GMT It is (high) time that I left.
我早该走了。
在假设语气结构里有时可以省略副词子句，条件一般暗含在片语或上下文里。
Alone by myself, I wouldn't have been delighted.
如果我单独一个人我是不会感到愉快的。
假设语气中的副词子句可以省略连接词if，此子句中的助动词had, were, should等要移至主语之前。
Were I Jane, I would be very pleased to marry you.
如果我是珍,我...]]> Fri, 25 Apr 2008 09:56:12 GMT 真实状况　wish后　　　　 　
从句动作先于主句动词动作　　现在时　　过去时
（be的过去式为 were）　　　　　　　　　　　　　　　 　
从句动作与主句动作同时发生　过去时　　过去完成时
（had + 过去分词）　　　　　　　　　　　　　　　　　　
将来不大可能实现的愿望　　　将来时　would/could +
　　　　　　　　　　　　　　　　　　　动词原形　　　　
I wish I were as tall as you....]]> Sat, 10 Jun 2006 00:09:00 GMT 　　I wake up only if the alarm clock rings. 只有闹钟响了，我才会醒。
　　If only the alarm clock had rung.　　　当时闹钟响了，就好了。
　　If only he comes early.　　　　　　　但愿他早点回来。
...]]> Sat, 10 Jun 2006 00:09:00 GMT 1） It is demanded / necessary / a pity + that…结构中的主语从句的谓语动词要用should 加动词原形， should 可省略。
句型：
　　　　(1)suggested
It is　 (2)important　　　　that…+ (should) do
　　　　(3) a pity
(1)suggested, ordered, proposed, required,　 demanded, requested, insisted； + (should) do
(2)important, necessary, natural, strange
a pity,　 a shame,...]]> Sat, 10 Jun 2006 00:09:00 GMT 　 Were they here now, they could help us.
　=If they were here now, they could help us.
　 Had you come earlier, you would have met him
　=If you had come earlier, you would have met him.　
　 Should it rain, the crops would be saved.
　=Were it to rain, the crops...]]> Sat, 10 Jun 2006 00:09:00 GMT 　　If you had asked him yesterday, you would know what to do now.
　 （从句与过去事实相反，主句与现在事实相反。）
　　If it had rained last night (过去), it would be very cold today (现在).
...]]> Sat, 10 Jun 2006 00:09:00 GMT 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...]]> Sat, 10 Jun 2006 00:09:00 GMT 时态关系
句型： 条件从句　　　 主句
　　 一般现在时　　 shall/will + 动词原形
　If he comes, he will bring his violin.
典型例题
　The volleyball match will be put off if it ___.　
A.　will rain　 B. rains　 C. rained　 D. is rained
　答案B。真实条件句主句为将来时，从句用一般现在时。
注意：
1） 在真实条件句中，主句不能用be going to表示将来，该用shall, will...]]> Sat, 10 Jun 2006 00:09:00 GMT 　　 虚拟语气用来表示说话人的主观愿望或假想，所说的是一个条件，不一定是事实，或与事实相反。
2） 在条件句中的应用
　　 条件句可分为两类，一类为真实条件句，一类为非真实条件句。非真实条件句表示的是假设的或实际可能性不大的情况，故采用虚拟语气。
...]]> Sat, 10 Jun 2006 00:08:54 GMT 　needn't have done表示： 过去不必做某事, 但事实上做了。
　John went to the station with the car to meet Mary, so she didn't need to walk back home. 约翰开车去车站接玛丽，所以她不必步行回家了。
　John went to the station with the car to meet Mary, so she needn't have walked back home. 约翰开车去车站接玛丽，所以她本不必步行回家了。 (Mary步行回家，没有遇上John的车。)
典型例题...]]> Sat, 10 Jun 2006 00:08:54 GMT 　 It is time that the children went to bed.
　 It is high time that the children should go to bed.
...]]>