请问can+have done 能否用于陈述句表示过去能够做某事呢?

请问can+have done 能否用于陈述句表示过去能够做某事呢? 请问could not have done/might not have done可用于虚拟语气中吗 need have done ,must have done ,can/could have done ,should have done 的区别是什么?意思是什么?主要用于哪种句型?请分别举例说明, can’t +have done All that can be done __been done.请问该用has还是 have? can have done和 could have done有什么区别?那can have done什么用法？ musn't have done can't have done用法区别 could have done 和 can have done 有什么区别?还有would have done can表示对过去的推测不能用于肯定句?语法书上讲：can have done表示可能已经做了某事,又讲：此时can 仍只用于否定句或疑问句,不用于肯定句.这是不是说这种情况：he can have done no work can't have done 的用法 情态动词+ have done一定用于虚拟语气吗 英语：should have done是否用于虚拟语气? 请问many能否代替any用于疑问句? must have done,must do,can't have done,can't do的区别 请问是have not only done ...but also done ...还是 have not only done ...but also have done ... can have done和could have done有无区别?can't have done和couldn't have done有无区别?如果有,区别是什么? 请问有find sb have done 请问HAVE SB DONE 不表示现在完成时