He is good at swimming.这里swim为什么要加ing?

swimming club \u4e2d\u7684swim\u4e3a\u4ec0\u4e48\u8981\u7528ing\u5f62\u5f0f\uff1f

swim(\u6e38\u6cf3)\u662f\u52a8\u8bcd,\u800cclub(\u4ff1\u4e50\u90e8)\u662f\u540d\u8bcd,\u52a8\u8bcd\u540e\u9762\u4e0d\u80fd\u52a0\u540d\u8bcd,\u540d\u8bcd\u53ea\u80fd\u7528\u5f62\u5bb9\u8bcd\u4fee\u9970
\u50cf\u8fd9\u79cd\u60c5\u51b5,\u53ea\u6709\u628aswim(v)\u53d8\u6210swimming(adj) \u5373\u53d8\u6210\u5b83\u7684\u5f62\u5bb9\u8bcd\u5f62\u5f0f
\u624d\u80fd\u4fee\u9970club\u8fd9\u4e2a\u540d\u8bcd

\u5f53\u7136\u662f swimming

\u56e0\u4e3abe good at doing sth \u56fa\u5b9a\u7528\u6cd5\u2018 \u64c5\u957f\u4e8e\u2026\u2026\u2019 AT\u662f\u4ecb\u8bcd\uff0c\u4ecb\u8bcd\u540e\u7684\u52a8\u8bcd\u8981\u7528ING\u5f62\u5f0f\u3002


\u52a0\u6cb9\uff01\u4e0d\u660e\u767d\u518d\u95ee\uff01\u5982\u679c\u5e2e\u5230\u4f60\uff0c\u8bf7\u91c7\u7eb3\uff0c\u8c22\u8c22\uff01

He is good at swimming. = He does well in swimming.
解析：be good at Sth.，这里动名词充当名词，所以要加ing。
中文：他擅长游泳。

固定用法： be good at doing sth 擅长于做……
at 是介词，介词后的动词要用ING形式

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在某方面很擅长, Ving是把动词变成名词, 指在游泳方面.

扩展阅读：he is very good ... good at swim ... he is good thought ... grandparents ... he is good at football ... in good condition ... pokemon go ... how do you do ... i m great ...