'd

From Wiktionary

Verb[change]

Simple present
will

Simple past
would

Negative
wouldn't

Contraction
'd

  1. (modal) A contraction of would.
    I'd go there if I could.

Verb[change]

Plain form
have

Plain present
have

Third person singular
has

Past
had

Present participle
having

Negative

haven't

hasn't

hadn't

None

Contracted

've

's

'd

None

  1. (auxiliary) A contraction of had.
    I'd seen it before.