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八、class, group, family等集合名词作主语
class, team, group, family, couple, club, enemy, army, government, company, firm, crowd, college, university, department等集合名词作主语时，采用意义一致：视作整体时是单数，若指构成各个集体的各个成员时是复数。如：
His family is a big one. 他的家庭是个大家庭。
Your family are quite well，I hope. 希望你家里人都好。
九、trousers等由两部分组成的复数名词作主语
trousers, glasses, shorts(短裤), stockings(长袜)，gloves等作主语时，谓语动词用复数，但若a pair of trousers之类的结构作主语时，谓语动词的数由pair的数来决定。如：
The trousers don't fit him, they are too small. 这条裤子他穿不合身，太小了。
This pair of shoes fits you better. 这双鞋子对你更合适。
Two pairs of your trousers are still at the cleaner's. 你的两条裤子还在洗衣店里。
十、sheep, means等单复数同形的名词作主语
means (方法手段)，works(工厂)，sheep, fish, aircraft(飞机)等单复数同形的名词作主语时，采用意义一致的原则：指一种方法或一家工厂时，谓语动词用单数，否则用复数。如：
Every possible means ________ to prevent the air pollution, but the sky is still not clear. (上海卷)
A. is used B. are used
C. has been used D. have been used
【分析】答案选C。由every可知，主语means是单数，排除B和D；由语境可知用现在完成时的被动语态，排除A。
十一、表示度量衡的复数名词作主语
表示时间、距离、度量、重量、金额等的复数名词作主语，被看作整体时，谓语动词用单数；但若与pass, go by等连用，指时间的流逝，或者与spend, waste等连用，指时间或金钱的花费时，谓语动词用复数。如：
Five minutes is enough to do this exercise.
Six months have passed, and we still have no news of them. 六个月过去了，我们依然没有他们的消息。
十二、population作主语
population作主语，谓语动词一般用单数，但若前面有分数、百分数或者表语是复数时，谓语动词用复数。如：
Three fifths of the population here are workers. 这里五分之三的人是工人。
The population in these villages still uses well water. 住在这些乡村里的人依然饮用井水。
