I like how we're slowly learning longer sentences. Up to four now and it's only the 4th lesson! :D
Why "They are my happy boys" isn't correct?
I think that would be "Ñuhi kirini taobi issi." I'm very much a beginner, but I think it has to do with certain adjectives preceding the noun, possibly to avoid confusion in cases like this.
I have the same problem, you might as well say "Nuhi taobi kirini" no?
A bit of an awkward English translation, isn't it? I suppose it could work if you were talking about your son anyway.