if如果从句什么时候用will,什么时候用would?
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if如果从句什么时候用will,什么时候用would?
if如果从句什么时候用will,什么时候用would?
if如果从句什么时候用will,什么时候用would?
表示虚拟语气时要用would,其他时候一般要用will
if引导的条件状语从句的分类及虚拟条件句的判断
1、可以把条件句分为两类:
1).真实条件句(Sentences of Real Condition):凡是假设的情况发生性可能很大,就是真实条件句。例如:
⑴、If I have time , I will help you with this work.如果我有时间会帮助你做此工作的。
⑵、As long as I...
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if引导的条件状语从句的分类及虚拟条件句的判断
1、可以把条件句分为两类:
1).真实条件句(Sentences of Real Condition):凡是假设的情况发生性可能很大,就是真实条件句。例如:
⑴、If I have time , I will help you with this work.如果我有时间会帮助你做此工作的。
⑵、As long as I say anything wrong, you must point it out.只要我说了什么错话,你一定要指出来。
⑶、If time permits, we'll go fishing together.(如果有时间的话,我们就一起去钓鱼。)
2).虚拟条件句(Sentences of Unreal Condition):当假设是不大可能实现时,就是虚拟条件句。例如:
⑴、If I were you , I would have attended the meeting. 如果我是你的话,就去参加会议了。
⑵、If he had come here yesterday, he would have seen his old friend.假如他昨天来这儿的话,就会看见他的老朋友。
⑴、If it had rained yesterday, we would have stayed at home.(如果昨天下雨的话,我们就会留在家里。)
2、.if条件状语从句中虚拟语气的判断
判断是真实条件句还是非真实条件句。只有在非真实条件句中才使用虚拟语气。通过句子意思,看假设的条件是否能够实现,能够实现是真实条件句,不能使用虚拟语气;假设的条件不能实现则是非真实条件句,要用虚拟语气。
判断这个假设是与哪个事实相反。通常有三种情况:①与过去事实相反。②与现在事实相反。③与将来事实可能相反。
3、“后退一步法”
后退一步法是指在准确地判断了该句与哪一事实相反后,按虚拟语气的后退一步法处理从句谓语动词的时态。即:在非真实条件状语从句中,谓语动词按正常情况“后退一步”。也就是:
①与过去事实相反,在从句中用过去完成时形式表示。
②与现在事实相反,在从句中用过去一般时形式表示。
③与将来事实可能相反,在从句中用过去将来时形式表示。
主句中则用情态动词would, should, could 等加一个与从句一致的动词形式。例:
⑴、If I had come her yesterday, I would have seen him.
⑵、If I were a teacher, I would be strict with my students.
⑶、If it should snow tomorrow, they couldn't go out.
4、注意事项
①if条件句中如有were, should, had,可以省去if,并使用倒装语序。
②在现代英语中if条件状与从句中的谓语动词如果是be其过去形式一般用were。
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