为什么问句的be interested in后接动词原形比如 ：“Are you interested in sports？”而且sports还加s为什么？

为什么问句的be interested in后接动词原形比如 ：“Are you interested in sports？”而且sports还加s为什么？ 短语be interested in 为什么是be interested in而不是interested in为什么要加be be interested in和be interested with的区别 be interested in的意思 be interested in为什么加doing be interested interested in和be interested in的区别 be interested in疑问句要不要改陈述句语序我的意思是be interested in的是一个问句。比如说：I’m interested in how many books he had read还是I’m interested in how many books had he read be interested in+动词的什么形式 be interested in的同义词要英文翻译 be interested in的意思和用法 be interested in 的替换短语是什么 谁知道be interested in的同义词, 为什么be interested in,be excited at 别说什么固定用法,从in和at的用法方面进行分析,为什么be interested 后面就必须用in,而be excited 后面就必须用at? you don ont interested in what i am saying ,这里为什么直接用interested in 不是be interested in be interested in doing和be interested in sb/sthbe interested in doing和be interested in sb/sth二者的区别是什么?造句! when henry was young,he___(be interested in)painting为什么答案是is interested in？ be interested in和be interested to的区别?（尽量详细）