Meaning of -'D in English

-'D

-'d /d/

1 . the short form of ‘would’:

I asked if she’d be willing to help.

2 . the short form of ‘had’:

Nobody knew where he’d gone.

3 . the short form of ‘did’:

Where’d you get that?

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.