be good at 的用法可以这样表达吗?she is good at play pingpang.

应该用be good at doing something
你的造句应该是she is be good at playing pingpong

to be good at doing sth.这是一个固定短语，意思是，擅于做某事
所以应该是She is good at playing pingpang.

she is good at playing pingpang. 应该这样

be good at doing sth

be good at + 名词(play 的名词就是动名词playing)

she is good at playing pingpang.

be good at (in) doing in可加可不加
be good at +n.表示在....方面在行

be good at后面应该加名词或者动名词,比如
You are good at English．
You are good at speaking English
所以你的句子可以改成
she is good at pingpang或者
she is good at playing pingpang

at是介词，后面应该加ing
所以这句应该说：
She is good at playing pingpang.

play 应该用ING形式
pingpang应该是 PINGPONG