She good at ping-pong at PE.还是She is good at ping-pong at PE.
问题描述：
She good at ping-pong at PE.还是She is good at ping-pong at PE.
She works hard at chinese.还是She is works hard at chinese.
答
She is good at ping-pong at PE.
【解释】be good at sth/doing sth.在某方面擅长/擅长做某事
She works hard at chinese.
【解释】work hard at sth.努力做某事.