The number of people taking part in the race were quiet great.

• Lỗi: Dùng động từ "were" cho chủ ngữ số ít "The number".
• Sửa: The number of people taking part in the race was quite great.

Despite he worked very hard, he failed his test.

• Lỗi: Cấu trúc "Despite" thường đi với danh từ hoặc cụm danh từ.
• Sửa: Despite working very hard, he failed his test.
• Hoặc: Although he worked very hard, he failed his test.

When he arrived at the beach, it was raining very hardly.

• Lỗi: Dạng so sánh hơn nhất của "hard" là "harder", không có "hardly". "Hardly" mang nghĩa "hầu như không".
• Sửa: When he arrived at the beach, it was raining very hard.

The search was called off for the sailors who were disappeared in the storm.

• Lỗi: "Disappear" là động từ bất quy tắc, quá khứ phân từ là "disappeared". Ở đây cần dùng quá khứ phân từ để tạo thành thì quá khứ hoàn thành.
• Sửa: The search was called off for the sailors who had disappeared in the storm.

He wishes he would own a bigger car.

• Lỗi: Câu điều ước không thể dùng thì tương lai (would own).
• Sửa: He wishes he owned a bigger car.