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虚拟语气
It is (high) time后接简单过去式,表示早该是...的时候了。
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
(07/02/2008 14:16:35) [查看全文]
1)用于wish后面的从句,表示与事实相反的情况,或表示将来不太可能实现的愿望。其宾语从句的动词形式为:
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. 
(04/25/2008 09:56:12) [查看全文]
only if表示"只有";if only则表示"如果……就好了"。If only也可用于陈述语气。
  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。
(06/10/2006 00:09:00) [查看全文]

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,
(06/10/2006 00:09:00) [查看全文]
虚拟条件句的从句部分如果含有were, should, 或had, 可将if省略,再把were, should或had 移到从句句首,实行倒装。
  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
(06/10/2006 00:09:00) [查看全文]
主句与从句的动作发生在不同的时间,这时主,从句谓语动词的虚拟语气形式因时间不同而不同,这叫做混合条件句。
  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).
(06/10/2006 00:09:00) [查看全文]
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
(06/10/2006 00:09:00) [查看全文]
真实条件句用于陈述语气,假设的情况可能发生,其中 if 是如果的意思。
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
(06/10/2006 00:09:00) [查看全文]
1) 概念
   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。
(06/10/2006 00:09:00) [查看全文]
didn't need to do表示: 过去不必做某事, 事实上也没做。.
 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
(06/10/2006 00:08:54) [查看全文]
It is (high) time that 后面的从句谓语动词要用过去式或用should加动词原形,但should不可省略。
  It is time that the children went to bed.
  It is high time that the children should go to bed.
(06/10/2006 00:08:54) [查看全文]
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