Quote:
Originally Posted by RoundGuy
Did you just make up a word?
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I'd've is a valid contraction, as are
she'd've,
it'd,
should've,
there're,
who're, and
would've. But you're cautioned against using them outside of dialogue and quotations.
Source: Chicago 16th ed., 5.103
For professional use I wouldn't touch them but forums, hey. YMMV if you're not in the US.