Sure, here are the correct forms of the verbs in the sentences:

1. Our friend (be) **is** a Chinese man.
2. You (look) **look** happy.
3. Duong (fly) **flies** to London twice a week.
4. They sometimes (go) **go** to the zoo.
5. John (go) **goes** fishing on Sundays.
6. A dog (have) **has** 4 legs.
7. There (be) **is** a picture on the wall.
8. My cat (catch) **catches** 2 mice a night.
9. We (like) **like** reading comic books.
10. My sister (eat) **eats** pho for breakfast.