Generally speaking, we don't shorten (contract) "have" when it is the main verb in a sentence. We usually write a contraction of "have" or "has" only when it is used as an auxilliary verb -- but not when it is the first word in a sentence. " [N] I've never seen a ghost.
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AnonymousAre you allowed to replace "you have" with "you've" in any situation?No. If the two words are conceptually separated in some way, the contraction is not possible.