Scientists suggest to build more natural reserves to protect wild endangered species.

1. • Lỗi: "suggest to build" sai ngữ pháp. "Suggest" thường đi với dạng V-ing hoặc "that + mệnh đề".
   • Sửa: Scientists suggest building more natural reserves to protect wild endangered species. - Hoặc: Scientists suggest that we build more natural reserves to protect wild endangered species.

2. The most crowded the bus got, the more difficult it was for me to breathe.

   • Lỗi: "The most crowded" sai cấu trúc so sánh kép.
   • Sửa: The more crowded the bus got, the more difficult it was for me to breathe.

3. They advised that we turned off our smartphones while they are charging to protect the battery.

   • Lỗi: "they are charging" không hợp lý về ngữ cảnh.
   • Sửa: They advised that we turn off our smartphones while charging them to protect the battery.
   • Hoặc: They advised that we turn off our smartphones while they are being charged to protect the battery.

4. Since three fourths of our planet's surface is covered with water, the amount of fresh water is just 3%.

   • Câu này không có lỗi sai về ngữ pháp.

5. The lowest region of the atmosphere surrounding Earth is troposphere which the weather occurs.

   • Lỗi: "which" dùng thay thế cho danh từ chỉ vật, không dùng để nối mệnh đề chỉ nơi chốn.
   • Sửa: The lowest region of the atmosphere surrounding Earth is the troposphere where the weather occurs. - Hoặc: The lowest region of the atmosphere surrounding Earth is the troposphere, which is where the weather occurs.