Here are the mistakes underlined and corrected:

1. **What is** school activity do you like?
**Correction**: What **school activities** do you like?

2. When does she **like** reading books? - Because she thinks it's fun.
**Correction**: When does she **like** to read books? - Because she thinks it's fun.

3. What are you **from**? - I'm from Malaysia.
**Correction**: What **country are you** from? - I'm from Malaysia.

4. I like swimming and **read** stories.
**Correction**: I like swimming and **reading** stories.

5. **She like** listening to music and dancing at school.
**Correction**: **She likes** listening to music and dancing at school.

6. What would you **likes** to be in the future? - I'd like to be a doctor.
**Correction**: What would you **like** to be in the future? - I'd like to be a doctor.