Put the following into the singular.
Model: The pupils work hard. — The pupil works hard.
1. The engineers go to the plant. 2. The students do their homework. 3. The trees grow well. 4. The boys do sports. 5. My friends study English. 6. The girls sing very well. 7. My friends call me Vic. 8. The students read books. 9. They talk about the weather.