teach fish to swim是

动词+宾语+宾语补语

翻译成中文是：孔夫子门前卖文章；夫子庙前卖文章;

[例句]You want to teach him englishYou're just offering to teach fish to swim.

动词+宾语+宾语补语中补语还可以是：doing /done等

doing表示宾语正在…，主动…，

done表示宾语被…或处于什么状态