英语翻译Leo hurt himself playing soccer.为什么这里用playing,语法点是什么?第二,

英语翻译Leo hurt himself playing soccer.为什么这里用playing,语法点是什么?第二, Did you hurt yourself playing soccer?请问这里为什么用playing? 有句话是：Did you hurt yourself playing soccer?请问这里为什么用playing? :i hurt myself playing soccer中playing做什么成份 Jack hurt his back playing volleyball.为什么用palying?什么语法? Playing sports is good for us 这里为什么用playing When he was playing football,he hurt himself 句型转换 I like playing soccer中的playing为什么不是play Did you hurt yourself playing soccer .此句中划线部分（piaying soccer They're( playing soccer).对括号提问并语法说明 Playing soccer s( ) great. HE IS PLAYING SOCCER