English translation: I'd is the contraction for I would and I had
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Explanation: Michael Swan, Practical English Usage: "Contractions are common and correct in informal writing: they represent the pronunciation of informal speech. They are not generally used in a formal style."
I'd is the contraction for I would and I had but not for I could or I should. The latter two must be spelled out.
Yes: must have = must've should've = should have?
could have = could've