为什么hobby 后跟动词ing形式如:My hobby is play vollerball.

为什么hobby 后跟动词ing形式如:My hobby is play vollerball. His hobby is playing football这里play为什么加ing my hobby is…,动词加ing吗 my hobby is [ ] [play] backetball My hobby is collecting stamps.为什么要用ing的形式啊? my favourite hobby is 后跟什么词呢?playing chess或者play chess? 正确形式填空My hobby is ____(listen)to music.如果加ing,为什么?不是现在进行时才加i My hobby is to play chess My hobby is to play computer games.可以这样吗?不是ing行吗 be动词am ia are 后面动词还要加ing吗?就是我们今天考试,His hobby is play volleyb （ Drawing ）（绘画）is my favourite hobby.为什么要加ing? Doing homework is not my hobby.为什么do要加ing?