Hi, WElcome to the Forum. 'Has/had/have' are not usually considered to be modals. Please try to provide a few sample sentences that we can comment on specifically.
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Helpme91) I have been driving my car for the last twelve years and there has never been an accident. Please explain me the use of "have been" and "has never been" in this sentence. 2)He told me to leave Simla at once, as mother had been taken ill. Same : Explanation for the use of "had been". 3)And where we use "Could have been.." Thanks.Start with this page.