the teacher would liketo choose (whoever)he thinks is energetic and clever as monitor
问题描述：
the teacher would liketo choose (whoever)he thinks is energetic and clever as monitor
为什么不可以those who?anyone?
答
如果是 those who 那么those 就是先行词,who就是定语从句的关系词,定语从句的谓语动词是is ,这事单数,而 those 是复数,矛盾了.
如果是anyone,那么anyone 就是定语从句的先行词了,而这个先行词在定语从句中要做is的主语,做主语关系词是不能省略的,因此,此处就缺少关系代词了.