英语翻译

问题描述:

英语翻译
1.Do you know who is the thief?
2.Do you know who was the thief?
3.Do you know who the thief is?
4.Do you know who the thief was?
请问哪个答案正确?
到底是哪个啊?怎么自己都说自己的对?

Do you know who the thief is?