Say if'd the contracted form of had or would
Examples
I'd like a cup of tea. = would
I knew I'd seen him before
1) You must try bunjee jumping! You'd love it!
2) She said she'd give him everything.
3) She said she'd given him everything.
4) I was tired because I'd been up since six.
5) I told you they'd arrive on time!
6) I told you they'd bought yhe house!