could have done能不能表示对过去事实的猜测用在肯定句中?与must have done may have done might have done

could have done能不能表示对过去事实的猜测用在肯定句中?与must have done may have done might have done would have done,might have done,could have done,should have done分别表示什么意思? could never have done could not have done May not have done 是表示可能不还是不可能 那Could not have done呢 could only have done表示对过去的推测,只可能...,是否等于must have done? couldn't have done与couldn't区别以及当could have done表示对过去的猜测时,could have done与could有什么区别? should have done能不能表示竟然做过某事 He could have caused a terrible accident.这句话怎么理解 could have done表示什么 Could have done would have done should have done could have been done ,could have 情态动词+have done 如 could have done,must have done,should have done 等等在如他么的否定词表示什么意思? 有没有can have done sth?could have done sth有两种意思吗?can't/couldn't have done sth意思又是什么能不能举几个例子? could never have done 造句 how could you have done could mightcould have done might have done在表示本有可能做某事时候有什么区别 should have done ,shouldn't have done.could have done,couldn't have done could have done和need have