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虚拟语气中,主句中用could ,would在语法和意义上是否有区别?

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虚拟语气中,主句中用could ,would在语法和意义上是否有区别?
若可能,请举出例子说明.
1在请求时,没区别
如 Could you go with me?=Would you go with me?
2在表示习性时,不用could ,用 would
Ipushed the door,but it wouldn't open.
我用力推门却推不开.
3could用在wish的句型中:
I wish I could go to the Moon.
4 would ,could 都可以用在带if条件句的虚拟语气主句中,意思大致不变.
If I had a lot of money,I would/could buy a set of house in Beijing.
5 表示推测时,不用would
She could have gone to the cinema .(她可能看电影去了)
---高三英语教师解答