人教版英语选修8，P38第十二行，有一句They couldn't have mats,blankets or quil

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人教版英语选修8，P38第十二行，有一句They couldn't have mats,blankets or quilts like we do. 可以在have后面加上had吗？因为我觉得这个是对过去的假设。如果不可以的话为什么不能加？
人教版选修8Unit5第一篇课文

解题思路：如果对过去情况推测判断的句子是疑问句和否定句，只能用can／could和can’t,／couldn’t。例如： He can’t have gone abroad; I saw him an hour ago. 他不可能去国外，我一个小时前还见到他呢。 --- Can he have passed the exam? --- No, he can’t have. He didn’t work hard. 他通过考试了吗？不，他不可能通过考试。他学习不努力。
解题过程：
句意是：他们不可能像我们一样有席子、毛毯或棉被。
couldn't have done对过去的虚拟语气,意思是本不能做某事,实际上做了。如：
He couldn’t have slept in Room 13.There is no Room 13 .他那时不会睡在13号房间，因为没有13号房间。
couldn't do是对过去事情的推测，意为“不可能做”。

人教版英语选修8，P38第十二行，有一句They couldn't have mats,blankets or quil they couldn't have done better是什么意思初三英语句型转换题 1.Man can't live if he couldn't have food or water couldn't have done? 英语翻译Mary couldn't have received my letter,or she should have 完成时态的用法mary couldn't have received my letter,or she have rep can’t / couldn’t have they have got _____ little help that they couldn't solve ___ You couldn't have seen such an animal, for they have already 英语翻译they didn't have no mothers or sisters,they didn't have She couldn't see or hear a____ she couldn't read or write