"He is good."
Translation:Maikaʻi ʻo ia.
The word/phrase " 'o ia" is being introduced in practice before it has come up in lessons (I assume it's covered in the third part of Greetings). To add to the confusion, it has (so far) only appeared in translations from Engklish to hawaiian, and irt was first used to translate "she".
I assume this means Hawaiian does not make the gender distinction that English does with third person pronouns, but feel that the word/phrase should not appear in practise until this point is cleared up in a lesson.
I don't think duolingo is focused on learners getting it right the first time. I think it is more about the spaced repetition and learning vocabulary through sentence building.
Ive done a few duolingo trees and expecting you to know words without ever having seen them before is part of each tree. at first it is annoying, but after a repeating the tree a few times u will forget about it as you will have learned the words.
I think the answer is sort of "all of the above" :) - from Nā Puke Wehewehe (http://www.wehewehe.org/gsdl2.85/cgi-bin/hdict?l=haw), here's the whole nine yards:
"mai.kaʻi - nvs. Good, fine, all right, well; good-looking; handsome, beautiful; goodness, righteousness, benefit, well-being, morality; good looks, good health. See Gram. 2.7. Pehea ʻoe? Maikaʻi nō. How are you? Fine. He wahine maikaʻi loa ke nānā aku, a woman very good to look at. He maikaʻi ʻōlelo, goodess in speech [with implication that actions are not good]. E ʻai ā pau maikaʻi ka iʻa, eat until the fish is completely finished. hoʻo.mai.kaʻi To thank, bless, render thanks, congratulate, make acceptable, praise, improve, perfect, correct; grateful, gratified, thankful. See inu hoʻomaikaʻi, palapala hoʻomaikaʻi, pule hoʻo maikaʻi. Hoʻomaikaʻi! Congratulations. ʻŌlelo hoʻomaikaʻi, compliment, congratulations. Hoʻomaikaʻi ʻana, congratulations, improvement. Lā Hoʻomaikaʻi, Thanksgiving Day."
So the more we practice, at times guess, and watch these comments - the more we learn! Kinda like kids learn! (although in my case...much more slowly ;) )