could have done可以表示对过去的推测吗?肯定句中

could have done可以表示对过去的推测吗?肯定句中 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? 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? should have done 可以表示对过去的推测 Could +have done在肯定陈述句中能表示对过去事情的推测吗 高中英语could have done 只表示过去可以做而未做,可是could have been却可以表示对过去的推测、.还有类似的情况吗?比如should have been,should have done 都表示过去应该做而未做 can could may maight 都可以表示猜测 时.1.can could may maight 都可以表示猜测 那么请问这四个可能性由大到小是怎样的?2.can/could have done 和may/ might have done 也都是表示对过去发生事情的猜测 哪一组 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 can have done可以用在过去的语境中并表示对“过去的过去”的推测吗?比如一篇文章用的是过去时态,要表示对发生在过去之前的事情的推测,可以用can have done吗?需不需要改成could? He could have caused a terrible accident.这句话怎么理解 could have done表示什么 can/could have done 和may/ might have done 表示对过去发生事情的猜测 哪一组可能性大一点?.can/could have done 和may/ might have done 都是表示对过去发生事情的猜测 哪一组可能性大一点? 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?