比较常用的量词如THE number of我们都很清楚是单数，而A number of则为复数。例如：
◆ The number of hardworking students in this class IS quite large.
再如majority, minority, and plurality这些词也是单复数都可行的，具体情况要看语境及上下文，比如要强调个体时就可以用单数。
◆ The majority of the students in this class ARE hard workers.
◆ In the Senate, the majority HAS coalesced into a unified voting block.
