Part I:
1. Less electricity will be used in the future. (chuyển sang bị động)
2. I used to get good mark when i was in a primary school. (khi có used to động từ chuyển về dạng nguyên thể)
Part 2:
1. How do most of classmates go to school? (khi hỏi về phương tiện --> dùng how)
2. How far is it from your house to school?
3. What are the students learning?
4. How does Ba often ride?
