Вусловное i’m afraid i don’t know so i can’t tell you. because the train was 10 minutes late i managed to catch it. the weather could be bad on saturday, in which case we’ll have to cancel the barbecue. i’m living in italy because i’m married an italian. sorry, i didn’t phone you but i lost a bit of paper with your number on it. we don’t get on well because she is so aggressive. there is the possibility of a train strike on monday so i might not be able to come. we’ve got the broken window because you and your friends were playing football in the back yard.

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.

If i knew, i would tell you
I would not catch a train if it wasn't 15 minutes late
we will cancel the barbeque if the weather is bad on saturday
i wouldn't live in Italu if i didn't marry an Italian
i would have called you if i hadn't lost a bit of paper with your number
if she wouldn't be so agressive we would get on well
if there is a train strike on monday i won't come
we wouldn't have broken the window if you and your friends hadn't played football in the back yard