1. I'm not myself today.
我今天不在状态。
2. I’m mixed up.
我弄混了。
3. Your guess is as good as mine.
我也没搞清楚。
4. I was messed up for a long time.
这些年我一塌糊涂。
5. You're a real nitwit.
你真是个糊涂虫。
6. I don't think she's all there.
我觉得她脑子不太清醒。
7. I just zoned out for a moment.
我刚才走神了。
8. Somehow my brain isn't functioning today.
我今天脑子不太好使。.