"Kaleo is a farmer."

Translation: He mahiʻai ʻo Kaleo.

[Tutu124325]

Wby is 'O Kaleo.mahi'ai 'o'ia. Wrong?

[Kamakea1]

This would have been correct although not the textbook answer: 'O Kaleo, he mahi'ai 'o ia. This is a sentence type that says something is a something else. The "he" is important in communicating that to the listener.