这个是谁的船？

Whose boat is this?

给个新足球。我喜欢足球。这个是谁的足球？

Here's a new football. I like footballs. Whose football is this?

“这个是谁？”她愤怒地询问鲍勃，好象她问的是一条从未看到过的极讨厌的虫子。

Who is this? she snapped to Bob, as if the object of her inquiry were a new and particularly obnoxious species of insect.