为什么She likes playing tennis 中的 playing 带有ing?不加可以吗?

为什么She likes playing tennis 中的 playing 带有ing?不加可以吗? playing tennis sounds interesting.中的play为什么加ing? How about playing tennis中为什么play加ing Playing computer games.中的playing为什么要加ing? 为什么【he likes playing compurter games】里playing要加ing,这是现在进行时吗? l think she likes playing tennis改为宾语从句 Who likes playing tennis?_______. 英语翻译一句话：她喜欢球类运动.she likes ball games可以吗?要加playing吗? she likes to play tennis和 she likes playing tennis 有什么区别 Tom likes playing football 这里play为什么要加ing 还有like为什么加S She likes playing basketball.为什么填piaying? She likes playing tennis a lot=She _ _ _playing tennis