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"Have" is the infinitive form (e.g., "I want to have lunch", "I will have lunch").

"Has"/"have" are present tense forms differing by whether the subject is third person singular ("He has hives") or not ("They/we/you have hives").

"Had" is the past tense form ("I/we/you/they/he had hives") or the perfect participle or (rarely) passive participle ("We have had hives" "A good time was had by all").

The forms of "have" can either be used as a verbal auxiliary expressing the perfect aspect or as a main verb, with no differences in form, though only the main verb has perfect or passive (i.e., "past") participles.

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11y ago

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