当非谓语动词用作句子主语时，谓语动词原则上要用单数。同学们做题时要注意，非谓语动词若带有自己的宾语，且其宾语为复数形式，此时不要受此影响而误用复数谓语。

【例1】Climbing hills _______ of great help to our health. (湖北十堰中考题)

A. was                   B. were                  C. is                        D. are

解析：句子主语climbing hills为动名词，故谓语动词要用单数形式，即答案为C。注意不要受climbing的宾语hills的影响而误用复数谓语。

十、综合主谓一致和其他语法知识

【例1】—Our hometown is becoming more and more beautiful.

—Sure. Many trees ________ every year. (四川广安中考题)

A. plant                 B. is planted         C. are planted      D. have planted

解析：由于trees与plant之间为被动关系，故句子应用被动语态，可排除A和D；又因为many trees为复数，故选C。

【例2】—I can’t find Ted for three days. Where is he?

—He ________ Beijing for a meeting. (广西玉林中考题)

A. has been to     B. has gone to     C. have been to   D. have gone to

解析：由于说话者说三天没找到特德，这说明特德离开去其他地方了，故应用have gone to而不是用have been to，可排除A和C；又因为主语是单数，故选B不选D。