В скобках которые. Пример If I'd known it was going to rain, I would have taken an umbrella with me.
She (arrive) home earlier if she hadn't met her classmate on the way.
Do you think he would have accepted us if we (offer) him better conditions?
We (not serve) eggs if you'd told us he was vegan.
I don't think he would have read the book if I (not recommend) it last summer.
gone to bowling with us if he had invited you?
He would never have started the training course if he (know) it was going to be so useless.