l like playing sports .为什么play后面加ing?

l like playing sports .为什么play后面加ing? Lucy like playing sports 为什么play后加ing 据首字母补全单词He doesn't like playing sports.(另：这里的play为什么加ing)He do后面加动词原形那为什么是Do you like playing football?play为什么要加ing I like playing volleyball为什么play要加ing? i like playing basketball 为什么play加ing 为什么Playing football.Play要加ing Tom likes playing football 这里play为什么要加ing 还有like为什么加S 什么情况加ingI like playing basketball.请解释一下这种情况为什么play加ing,￥@%￥% 为什么like后面加ing 英文中,为什么 like后的动词要加ing?如：I like playing sports I like talking My favorite sport is playing basketball 中的play后面为什么要加ing形式