Happy is an adjective. 'I am happy.' 'She is happy.' Happiness is a noun. 'You have brought happiness into my life.' 'Peace brings joy and happiness.' I,hope this helps : )

Only 'I am very happy' is correct.

Happy is an adjective happeness is a noun. F.e. After finding the happeness you are happy????

happiness 是 名词 I am very happiness 这句是有个错误的表示方式

Sorry, e=i