什么时候用虚拟语气
问题一：如何使用虚拟语气?什么情况下才用? 虚拟语气用来表示说话人的主观愿望或假想，而不表示客观存在的事实，所说的是一个条件，不一定是事实，或与事实相反。即当一个人说话时欲强调其所说的话是基于自己的主观想法，愿望，假想，猜测，怀疑或建议，而不是根据客观实际，就用虚拟语气。1、表示与现在事实相反的情况： 从句：If 主语+过去时(Be动词用were) 主句：主语+should/would/could/might+do
2、表示与过去事实相反的情况 储 从句：If 主语+had+done 主句：主语+should/would/could/might+have done
3、表示对将来情况的主观推测 从句：①if+主语+were to do 主句：①主语+should/would/could/might+do ②if+主语+did/were ②主语+should/would/could/might+do ③if+主语+should+do ③主语+should/would/could/might+do
问题二：if什么时候引导条件状语从句，什么时候用虚拟语气 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 e 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 e 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.
问题三：虚拟语气什么时候用倒装 在 if 引导的虚拟条件句中， 如果 从句中 含有 were , should , had done 时，if 省略， 就要用倒装。
eg . If I were you , I would not do it .
Were I you , I would not do it .
If It should rain tomorrow , we would not go outing .
Should it rain tomorrow , we would not go outing .
If he had driven carefully , the accident wouldn't have happened .
Had he driven carefully , the accident wouldn't have happened .
问题四：insist什么时候用虚拟语气 insist这个单词基本理解为两种意思，到那时这两意思翻译出来特别接近，所以还是直接理解句意的语境会比较好：
当insist意为”某人坚持认为应该做某事“时，表示在这个人坚持的时候，某事还没发生，而此人主意已定，必须要这么做，可以简单理解为”其坚持的事还没发生“，这时候用虚拟语气。例：She insists that we leave at 6:00 tomorrow morning, or we might miss the flight. 这句话就是她坚持大家明天应该怎样，虚拟。
当insist意为”某人坚持说某事是怎样怎样的“时，表示某人坚持说的时候，某事已经发生了，而此人只是在对听话人提供一个信息（可能是真相，可能是说谎），可以简单理解为”其坚持的事已经发生“，这时候用正常的时态。例：Little Tony insisted that he had seen a man flying in the sky last night. 这句话就是昨天晚上发生了什么事，而小朋友坚持说他当时目睹了什么样的情况（这个情况可能是真的也可能是假的）不用虚拟。
问题五：如何使用虚拟语气?什么情况下才用? 虚拟语气用来表示说话人的主观愿望或假想，而不表示客观存在的事实，所说的是一个条件，不一定是事实，或与事实相反。即当一个人说话时欲强调其所说的话是基于自己的主观想法，愿望，假想，猜测，怀疑或建议，而不是根据客观实际，就用虚拟语气。
1、表示与现在事实相反的情况： 从句：If 主语+过去时(Be动词用were) 主句：主语+should/would/could/might+do
2、表示与过去事实相反的情况 储 从句：If 主语+had+done 主句：主语+should/would/could/might+have done
3、表示对将来情况的主观推测 从句：①if+主语+were to do 主句：①主语+should/would/could/might+do ②if+主语+did/were ②主语+should/would/could/might+do ③if+主语+should+do ③主语+should/would/could/might+do
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