"I'm in a good mood today," 为什麽要加in?im a good mood today不行吗?

I'm in a good mood today, 为什麽要加in?im a good mood today不行吗? I'm in a good mood,full of 又回报噢 I in a good mood today!You put a horse! keep in a good mood Today is my birthday,I am in a good mood I am in a good mood,bad mood I was there.Your attention to my good mood,bad mood,you did not no I'm have a bad mood还是I'm in bad mood?还是都行 I'm in the mood I'm always in a bad mood什么意思 I'm In A Mood For Love 歌词 Good afternoon, in a bad mood 是什么意思 Sunny day in a good mood,haah 是be in the good mood 还是be in a good mood是be in the good mood还是be in a good mood I’m in the mood for French I'm in a mood today.I love to be in the middle of the action. I'm not sure what I'm in a mood for?是啥意思 Honey,I am in a bad mood Maintaining a good mood