（ Drawing ）（绘画）is my favourite hobby.为什么要加ing?

（ Drawing ）（绘画）is my favourite hobby.为什么要加ing? （）绘画is my favourite hobby （绘画）is my favourant hobby. Doing homework is not my hobby.为什么do要加ing? my hobby is drawing 还是my hobby is drawing pictures My favourite hobby is reading（对划线部分提问） 为什么favourite后加动词ing.如：My favourite sport is swimming.不是只有I l my hobby is draw还是my hobby is drawing my hobby is…,动词加ing吗 His hobby is playing football这里play为什么加ing His hobby is playing baseball.其中,说明爱好为什么要加ing? My hobby is collecting stamps.为什么要用ing的形式啊?