谁在

who is …ing

→ 谁
phrase Common #4,872
who is …ing 在 marks an action in progress.
CH: 谁在外面唱歌?
EN: Who is singing outside?

谁在写故事?

Who is writing the story?

— 印度有嘻哈 (2019)

谁在弹钢琴?

Who is playing the piano?

谁在减肥?

Who is on a diet?

谁在照顾我们

Who is taking care of us?

— 几近成名 (2000)

我知道谁在协助希优顿王

I know who is assisting King Xiudun.

— 指环王3:王者无敌 (2003)

谁在看我?

Who is watching me?

— 瓦塞浦黑帮(上) (2012)

你不在的时候谁在照看狗?

Who looks after the dog when you're away?

谁在吵

Who’s making all that noise?

— 大红灯笼高高挂 (1991)

谁在掌控谁?

Who is controlling whom?

— 印度有嘻哈 (2019)

那家伙以为谁在养活他啊

Who does that guy think is supporting him?

— 空之境界 第五章 矛盾螺旋 (2008)

谁在开枪

Who is shooting?

— 巴克劳 (2019)

谁在问我?

Who's asking me?

— 赫鲁斯塔廖夫,开车! (1999)

谁在敲门?

Who is knocking at the door?

— 虎口脱险 (1966)