She good at ping-pong at PE.还是She is good at ping-pong at PE

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.

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.

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