The patient is no supposed to have left hospital so soon as he is not fully recovered from his illness.和：You oughn't to have gone to his funeral.I know it would upset you.这两句话中在be supposed to do 和 oughn't to do的动词前面，都出现了一个have.感觉有点多余，请问have在这里做什么用法，什么情况下要添这个have?
热心网友
第一个，强调left的动作发生在suppose之前，用完成时态，含有，没有预料到的意思，很意外。第二个是虚拟语气，你可以看看语法书关于虚拟语气的用法。此处，因为是过去时，所以要用退后一个时态，用完成时。 还有，是不是应该是 not supposed to 而不是no supposed？呵呵，高考一过，我的语法就差很多了，有错误的地方，帮我指出来哦！