Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.The amounts of oxygen and nitrogen in the air almost always remain stable, but the amount of water vapor vary considerably. A. vary B. almost always C. The amount of D....
Đọc tiếp
Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
The amounts of oxygen and nitrogen in the air almost always remain stable, but the amount of water vapor vary considerably.
A. vary
B. almost always
C. The amount of
D. stable
Đáp án A
Vary=> varies
The amount of +N(it)+ V(it): luợng lớn...
The amounts of +N (nhiều)+ V (nhiều): luợng lớn
Nên trong câu này chủ ngữ ở mệnh đề sau là chủ ngữ số ít-> động từ thêm “s/es”.