I’m not in the mood.我没心情，没兴致

1 in the mood for/to do sth 有心情，兴致勃勃去做…，想去做…

--Would you like to see a movie? 你想看电影吗？

--No, I'm not in the mood.  不想，我没心情

I'm sorry, I'm just not in the mood to talk.不好意思，我不想说话。

Right now, I’m in the mood for a drink.我现在就想喝一杯。

2、in a good/bad/blue mood 心情好/心情不好/心情低落

She’s been in a really good mood recently.她最近心情大好。

I can tell that he’s in a blue mood right now.我可以看出来他现在心情不好。