If he felt very ill. he would stay in the bed.
If they liked to travelling they would go to Europe.
If I hadn't made a lot of mistakes in my vocabulary test, I wouldn't have spent so much time learning the words.
If she hadn't watched TV until midnight, she was never late in the morning.
If he just saw the incident on the road, he would call the police.
If I hadn't bought a present for my mother, I'd brought a lovely flowers for her.