there are some rooms in the beach House,the smallest of which served as a kitchen。我想问一

there are some rooms in the beach House,the smallest of which served as a kitchen这个……房子里有一些房间，其中最小的一间曾经适合做为厨房使用。

the smallest of which是从句的主语，是第三人称单数，谓语动词是served(不及物动词）, 作“适合”解释，不需要使用被动语态， 所以不用加is 或 are

serve

:英 [sɜ:v]?美 [sɜrv] ?vt.& vi.（为…）服务；?任（职）；?提供；?端上

vt. 招待；?（为…）工作；?对…有用；?向…供应

vi. 适合；?服役；?供职；?[网球、羽毛球]发球

n. ? 网球等发球；?发球权；?所发的球；

句子it is reported that about two hundred people died in the accident, many of them are children.这边为什么有用了many of them?

原因：children是复数，所以主语明显也用复数many