whose

Whose umbrella is this? It has been left in the hallway for three days.

(Chinese) 这是谁的雨伞？它在走廊里放了三天了。

I found a wallet on the street and I am trying to find whose it is.

(Chinese) 我在街上捡到一个钱包，正试着找它是谁的。

He is the student whose father works as a famous scientist.

(Chinese) 他就是那个父亲是著名科学家的学生。

We stayed in an old hotel whose walls were covered in historic paintings.

(Chinese) 我们住进了一家老旅馆，它的墙上挂满了历史画作。