If I knew, I would tell you.
If the train had not been 10 minutes late, I wuldn't have managed to catch it.
We’ll have to cancel the barbecue if the weather is bad on Saturday.
I wouldn't be living in Italy, if I were not married to an Italian.
If I hadn't lost a bit of paper with your number on it, I would have phoned you.
If she were not so aggressive, we would get on well.
I may not be able to come if there is a train strike on Monday.
We wouldn't have got the broken window if you and your friends hadn't been playing football in the back yard.