that'd = that would
That'd be nice = That would be nice
what'd = what did
- What'd you do on your vacation? = What did you do on your vacation?
what'd = what would
- What'd be the best thing to do? = What would be the best thing to do?
it'd = it had
- It'd better be good = It had better be good
it'd = it would
- It'd be a nice thing to do = It would be a nice thing to do