1. How would I know?
我怎么知道？

2. None of my business.
不关我的事。

3. I'm innocent.
我是清白的。

4. You have get the wrong person.
你们找错人了。

5. I know nothing about this.
我对此一无所知。

6. It's nothing to do with me.
这事跟我无关。

7. I was wronged.
我是被冤枉的。

8. It's not my job.
那跟我无关。

9. I didn't do it.
不是我干的

10. I was forced to do it.
我是被迫那样做的。

11. I didn't do it on purpose.
我不是故意的。