The key to exercise solutions in chapter Unit 40 - if I had known ... I wish I had known ... for the textbook English Grammar in Use with authors Raymond Murphy from Cambridge University Press
Question
Put the verb into the correct form.
Answer
If I'd seen you, I would have said hello.
If she'd missed the train, she would have missed her flight too.
I'd have forgotten if you hadn't reminded me.
If I'd had your email address, I'd have sent you an email.
they'd have enjoyed it more if the weather had been better.