I found his hobby collecting stamps.<br/><br/>The real question is what the word 'collecting' is.<br/><br/>Is it a gerund or a participle?<br/><br/>His hobby is collecting stamps.<br/><br/>In this case, it' obvious that collecting is a gerund. <br/><br/>But people say that gerund can't be used for these kind of above sentences.<br/><br/>If so, collecting has to be a present participle, right? But his hobby can't be a subject for the verb, to collect, right?<br/><br/>I know "I found his hobby to be collectiong stamps" would make better sense. But I'm wondering the above sentence can be right or not.<br/><br/>Thank you.