找错误并改正:My friend Tim is good at swim.

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找错误并改正:My friend Tim is good at swim.

找错误并改正:My friend Tim is good at swim.
找错误并改正:My friend Tim is good at swim.

找错误并改正:My friend Tim is good at swim.
swim改为swimming
be good at doing 擅长做...固定用法
因为其中at为介词,所以后面接动词要名词化
可以理解为
在.方面不错
在游泳方面不错
所以swim游泳方面,应该采用名词形式的swimming

My friend Tim is good at swimming.
be good at doing sth擅长做某事

my friend tim is good at swimming
be good at doing sth.擅长做某事

swim改成swimming
擅长做某事是be good at dong sth