Meaning of 'D in English
1. contraction of had: I was glad they'd gone.
2. contraction of did: Where'd they go?
3. contraction of should or would: He'd like to go. I'd like to remind you of your promise.
4. contraction of - ed: She OK'd the plan.
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012