f I'd known you were in hospital, I'd have visited you.
If I had known you were in hospital, I would have visited you.
I'd have bought you a present if I'd known it was your birthday.
I would have bought you a present if I had known it was your birthday.
If you'd given me your e-mail, I'd have written to you.
If you had given me your e-mail, I would have written to you.Would we have gone?
Wouldn't we have gone?
