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

1. Nam often **goes** to school by bike every day.
2. A lot of people **go** to work by car.
3. John usually **takes** the bus to school.
4. He **plays** volleyball but he **doesn't enjoy** it.
5. School children **wear** uniform on Monday.
6. Mary often **goes** to work on foot.
7. Bad students never **work** hard.
8. They **are not** doctors.
9. He **will call** you tomorrow.
10. Mr. Nam **will come** and **help** me tomorrow.
11. I enjoy **fishing** because it **is** relaxing.
12. Jane will play chess after she **finishes** school.
13. What **does** your mother often **do** at weekends?
14. I think, in the future people **will not play** individual games.
15. We find **arranging** flowers interesting because it **helps** us relax.
16. I **will not collect** dolls when I grow up.
17. We **went** to that village to do volunteer work last week.
18. My uncle **moved** to Da Lat in 2005.
19. My parents **bought** this house 20 years ago.
20. We **did not take** photos when we came there.
21. The students **were not** at school on last Monday.
22. Lan **was** at home when we went out.
23. Where **were** you last Sunday?
24. They **helped** the elderly people cook food some days ago.
25. My father **has not played** any sport since last year.