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what is usage of could have. I am not asking from you about perfect infinitive. The structure of perfect infinitive is (to have v3). But here it is only could have not v3 form.

closed as unclear what you're asking by Mari-Lou A, Jim, Skooba, tchrist Jan 10 at 18:13

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  • I suppose v3 stands for Past Participle. But "perfect infinitive" is news to me. Do you mean the Present Perfect? The structure of which I think you are you speaking of "subj + could(not)/might and must/can't have + PP" is used for speculation. "He could have taken the train that explains why he is late" – Mari-Lou A Jan 10 at 15:26
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    You need to explain more what's the trouble. Your question is unclear. – Mari-Lou A Jan 10 at 15:26
  • I think OP may be asking about the elided form "could have", for example: Why didn't you ask for more time? / Well, I could have (asked for more time) now that you tell me. – Gustavson Jan 10 at 16:05

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