1. If John did his homework, he would get good marks.
2. If he took all his books and copybooks at school, he could take notes during the classes.
3. If he learned his lessons, he would give good answers.
4. If he talked to his classmates about his problems, he would have more friends.
5. If John read books, he would learn a lot of interesting things.
6. If he went to bed early, he would get up early in the morning.