Expressing your emotions is an important part of communication. Adjectives are used when expressing emotions.
Emotions are usually expressed straightforwardly, therefore informal speeches are widely used. Here are some useful expressions. Click here to learn about the sentence ending particles. ("naa", "nee" etc.)
Ureshii wa. (Female speech) うれしいわ｡
Shiawase da wa. (F) 幸せだわ｡
Zannen nee. (F) 残念ねえ｡
Kanashii wa. (F) 悲しいわ｡
When describing someone's emotions, "~sou desu (looks, seems)" is added to the stem of the adjective.