they are doing ....
比如
看电视：they are watching the television
聊天：they are chatting
吃饭：they are having dinner
They are ....(正在做什么就写什么）
比如：They are shopping.
答:
They are singsing. (他们在唱歌）
They are doing housework.（他们在打扫房间）
they are surfing the internet
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