there is a boy doing/do/is doing/who is doing那个是对

there is a boy doing/do/is doing/who is doing那个是对

doing对

doing

who is doing

there is a boy doing和there is a boy who is doing都是符合英语语法的。

there is a boy doing (sth.). 意思是有个男孩子正在做某事。属于“There be sb. doing sth.”句式。
如：There is a boy singing. 哪里有个男孩在唱歌。

there is a boy who is doing (sth.). 中包含了一个定语从句。"who is doing (sth.)"做"a boy"的定语从句。译为：有一个正在做某事的男孩子。
如：There is a boy who is singing. 哪里有个正在唱歌的男孩。

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