V/ Find out the mistake and correct
1. She must wear uniform when she was in duty last year.             ___________
2. The students ought to learn their lessons careful before the exams.        ___________
3. The baby doesn’t look happy. I think she is crying.                ___________
4. Don’t worry so much. The children can look after themselves.        ___________
5. The water isn’t enough clean to swim in.                         ___________
6. George can’t go out with us this evening. He have to work.            ___________
7. Children enjoy to read picture book.                        ___________
8. You must not let children to play in the kitchen.                    ___________