② can(could)＋have＋done，表示对过去发生事情的“不肯定”，常用于否定句和疑问句。
He can't have been to your home. He doesn't know your address.
他不可能去过你家，他不知道你的地址。

③ should＋have＋done，表示“某事本该早做而实际未做”，用于肯定句。
You should have been here five minutes ago.

你五分钟前就该来了。

5.have用于某些短语，表示固定的意思。
① have a word with sb.，表示：和某人说句话
Where's Peter? I want to have a word with him.
Peter在哪儿?我想和他谈谈。

② had better＋不带to的动词不定式，表示：…最好…
I'd better go and look for him now.
我最好现在就去找他。

③ have nothing / something to do with，表示：和…无 / 有关系
They have nothing to do with each other and follow different aims. 

他们彼此没有关系，目的也不同。