Unit 102. I have no idea.
第102单元 我不清楚。
A: What's wrong with Debbie today? She seems upset about something.
甲：黛比今天怎么啦？她似乎有些心烦意乱。
B: I have no idea. Maybe she had a fight with her husband.
乙：我不清楚。她可能和她先生吵架了吧。

类似用语
I don't know.
我不知道。
I don't have a clue.
我毫无线索。
I haven't the slightest/foggiest idea.
我一点都不清楚。

百宝箱
句型“人+ be/feel upset about+事”表示“某人对某事感到心烦意乱”，此处upset是过去分词作形容词，表示“心情难过的，沮丧低落的”。upset亦可作动词用，表示“使某人心情不悦”，其动词的三种时态同原形。
Tommy upset Jenny by saying she was fat.
（汤米说珍妮胖，令珍妮不悦。）