玛丽一个人住在三楼，她的丈夫在悉尼住。请帮忙

Mary lives on the 3rd floor alone while her husband lives in Sydney.

一楼的, 在几楼好象是用on..... 介词.....

Mary lives at the 3rd floor alone, while her husband lives in Sydney.

Mary is living on the third floor by herself.Her hasband is living in sydney.

Mary stays on the third floor alone, and her husband stays in Sydney.

Mary lives at the 3rd floor alone, while her husband lives in Sydney