If we hadn't missed our train, we wouldn't be late for the conference.
If she hadn't failed her exam in Maths, she wouldn't have to take the exam again.
If they had told us the truth, we would know what to do.
If the plane had arrived on time, we wouldn't have problems with our luggage.
If I ahd time for the picture galley, I would know something about this modern artist.
If the party had been a success, they would have to arrange another party.
If we had gone to Brighton, we would look suntanned.