<u>Happiness</u><u> </u>is a feeling of joy that usually occurs / takes place when you feel enthusiastic to do something or when something good happens in your life.
For example, <u>Her </u><u>brother </u><u>returning </u><u>back</u><u> </u><u>home </u><u>from </u><u>the </u><u>military</u><u> </u><u>is </u><u>the </u><u>cause </u><u>/</u><u> </u><u>reason </u><u>for </u><u>her </u><em><u>happiness</u></em><em><u>.</u></em>