American English

Definition of have auxiliary verb from the Oxford Advanced American Dictionary

      

    have

     auxiliary verb
    auxiliary verb
    NAmE//həv//
     
    , NAmE//əv//
     
    , NAmE//v//
     
    , NAmE//hæv//
     
     
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  1. 1  used with the past participle to form perfect tenses I've finished my work. He's gone home, hasn't he? “Have you seen it? ” “Yes, I have/No, I haven't.” She'll have had the results by now. Had they left before you got there? If I hadn't seen it with my own eyes I wouldn't have believed it.
  2. 2(formal) Had I known that (= if I had known that) I would never have come.
See the Oxford Advanced Learner's Dictionary entry: have