her baby is sleeping on upstairs 错在哪

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her baby is sleeping on upstairs 错在哪
her baby is sleeping on upstairs 错在哪

her baby is sleeping on upstairs 错在哪
应该是her baby is sleeping on the stairs.
upstair 是副词意思是在楼上,而the是定冠词不能放在副词之前
楼梯是stair

开头没大写,结尾没写句号,还有不用加on,upstairs已经是副词了,不需要on

upstairs 是副词, 不需要on

upstairs 前面不需要加on

不用on

应该是:her baby is sleeping in upstair.

应该改为:Her baby is sleeping on the upstair.