sells 为什么这个动词要加s? This department store sells a large number of different things.请问为啥sell要加s 如果说department store是单数的话后面动词加s 为何The writer read a few line,but he did not understand a word.这里的read就不加s 所以我认为只有在she he it和一些人名后单数动词才会加s 我就搞不懂一个百货商店还第三人称单数?郁闷死……