作业帮如何区分if条件句和虚拟语气
来源：学生作业帮 编辑：拍题作业网作业帮 分类：英语作业 时间：2024/04/30 19:38:59
如何区分if条件句和虚拟语气
是虚拟语气,用一般过去时had表示对现在情况的虚拟.
what if I do not konw anyone 是what if这个固定词组,表示假使
...;若是
,不是虚拟.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.
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.⑶、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
,并使用倒装语序.
what if I do not konw anyone 是what if这个固定词组,表示假使
...;若是
,不是虚拟.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.
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.⑶、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
,并使用倒装语序.