情 emotion

Q: What emotion are you feeling ?

A: My heart is blue ever since JOE Stalin left me.

a feeling, an emotion ★★★★★
感 (feeling) + 情 (emotion) = 感情 (a feeling, an emotion)

circumstances ★★☆☆☆
事 (action/ incident) + 情 (emotion) = 事情 (circumstances)

circumstances. A euphemism for 'bad situation': crushing debt, mother is a prostitute, etc, in trouble with the mob, etc.

彼女、事情がありそうね。 (She looks like she comes from Circumstances, doesn't she?)

事情 also differs from other 'situation' words because it emphasizes the circumstances behind a person's actions. (i.e. the boss says, 'You were late to work again, but if you explain your situation, I might not punish you.')

affection : more than friendship and less than love. ★☆☆☆☆
愛 (love) + 情 (emotion) = 愛情 (affection : more than friendship and less than love.)

facial expression ☆☆☆☆☆
表 (express) + 情 (emotion) = 表情 (facial expression)

facial expression - although most people say "XXXの顔をした”　（ｘｘｘのかおをした）, meaning "She made an xxx-face."