It's hard to relate to someone who has such wild/extreme 'mood swings'. [=someone whose mood changes very quickly]
She turned down the lights and lit a candle to create a more romantic 'mood'. [='atmosphere']
I'm sorry. I'm just not 'in the mood to talk'. [=I do not want to talk to anyone right now]
(..) from the depths of hell. The bards will sing of their glory forever. Come, let's drink to their memory. I want you to raise the first cup. I am not in a mood for marrymaking. I'll ride down to marine, to prepare the boat. We still leave tomorrow, on the tide. Do we not? Aye. My fays. (..)2007 Beowulf