could only have done表示对过去的推测,只可能...,是否等于must have done?

could only have done表示对过去的推测,只可能...,是否等于must have done? could never have done could not have done Could have done would have done should have done could have been done ,could have could never have done 造句 how could you have done would have done,might have done,could have done,should have done分别表示什么意思? should have done ,shouldn't have done.could have done,couldn't have done could have done和need have could have done和would have done的区别 should have done和could have done的区别? 高中英语中might have done 和could have done 英语：should have done与could have done区别? could have done 和 might have done 的区别 请问：当only用在完成时时,是have only done ,only have done还是 have done only? 请问是have not only done ...but also done ...还是 have not only done ...but also have done ... I could have done without 怎么翻译?