I'd have helped if I had've known.
- Votes: 664
- Comments: 7
- Added: September 2004
Why is it bad?!
It is prescriptively incorrect from the standpoint of Standard English, but descriptively correct in certain nonstandard dialects.
I'd have helped if I'd known. Third conditional.
I could have helped if I had have known
It is not a standard construction in English.
I would have helped, had I known.
2. I'd helped if I had known.
3. Had I had the knowledge, I would have helped.
'Had have' is not English.