3, If my brother had left the car keys, I could have picked him up at the station.

4, If enough money were spent on cancer research, a prevention would be found.

5, If the wind weren’t blowing hard, I would take the boat out for a ride.

6, If Rex knew your mobile number, he could contact you.

7, If you do not do it carefully, you’ll feel sorry afterwards.

8, If Nick didn’t ignore Lucy, she would not get angry at him.

9, If Nick had a map, he could find the way.

10, If I had a dictionary, I could look the word up.

11, If she had listened to my directions, she would not have turned down the wrong way.

12, If Linus weren’t smart, he would not find clever solutions to life’s problems.

13, If you do not speak clearly, the audience won’t understand you.

14, If the airport had not been closed, she could have flown to Rome.

15, If my parents didn’t live so far away, we would visit our parents very often.