Mỗi câu sau chứa một lỗi sai. Tìm và sửa chúng

Dưới đây là các lỗi sai trong mỗi câu và cách sửa chúng:

1. **Are you do homework?** → **Do you do homework?**
2. **The children play football in the back yard at the moment.** → **The children are playing football in the back yard at the moment.**
3. **What does your elder sister doing?** → **What is your elder sister doing?**
4. **I could. These people are fight with each other.** → **I could. These people are fighting with each other.**
5. **Nina is tries very hard for the upcoming exam.** → **Nina is trying very hard for the upcoming exam.**

Nếu bạn cần thêm sự trợ giúp, hãy cho tôi biết!