1. I'm so depressed.
我很郁闷.
2. I feel so upset.
我觉得很沮丧.
3. I'm in a bad mood today. / I'm moody today.
我今天心情不好.
4. I feel kind of blue today.
我今天有点"郁闷".
5. I feel low today.
我今天心情(有点)低落.
6. I'm so down.
我心情很低落.
9. I can't put my finger on what's wrong.
我不晓得什么地方不对劲儿.
7. I'm a bit down in the mouth today.
我今天有点闷闷不乐的.
8. I've been down in the dumps recently.
我最近很"郁闷".