Here are the corrections for each sentence:

1. **What subjects does he have today?**
- Correction: "has" → "have"

2. **There are two glasses of milk on the table.**
- Correction: "glass" → "glasses"

3. **She studies English on Wednesday and Friday.**
- Correction: "study" → "studies"

4. **They are our grandparents.**
- Correction: "He" → "They"

5. **Where’s your school? - It’s in the village.**
- Correction: "on" → "in"

6. **Monday is the first day of the week.**
- Correction: "second" → "first" (or you can keep it as second, depending on the context, as many consider Monday the first day of the week)

7. **My brother has Vietnamese every day.**
- Correction: "have" → "has", "on" → "every"

8. **Our family has five people.**
- Correction: "have" → "has", "peoples" → "people"

9. **My brothers have maths and Vietnamese every day.**
- Correction: "has" → "have"

10. **My mother can drive a car carefully.**
- Correction: "drives" → "drive"

Here’s the corrected list:

1. What subjects does he have today?
2. There are two glasses of milk on the table.
3. She studies English on Wednesday and Friday.
4. They are our grandparents.
5. Where’s your school? - It’s in the village.
6. Monday is the first day of the week.
7. My brother has Vietnamese every day.
8. Our family has five people.
9. My brothers have maths and Vietnamese every day.
10. My mother can drive a car carefully.