2. A childkid is boating. 3. A child kid is riding a bike A child is taking photos. 5. A girl is listening to the music. 6. A child is swimming. 其实,你的问题与翻译有些不一致。问: What are you doing? 要用I'm . 回答。而 A child is boating. 之类的则是要回答 What's a child doing? or What are they doing?