Unit 87. How should I know?
第87单元 我怎么不知道？
A: Why isn't the project done yet?
甲：为什么这计划还未完成？
B: How should I know? It's not my responsibility.
乙：我怎么知道？那又不是我的责任。

类似用语
Don't ask me.
不要问我。
You're asking the wrong person.
你问错人了。

百宝箱
“Why isn't the project done yet?”句中的done是动词do的过去分词，表示“被做完”，但亦可作形容词用，表示“做完的”，修饰“人”，常使用“人+be done with+事”句型。
I'm done with my homework． （我功课做完了。）
= I'm through with my homework.
= I'm finished with my homework.
=I have dorie my homework.