During a learning tree lesson (not strengthen skills), I put "It generally is green," but it says it was wrong. I am a native English speaker and it sounds perfectly fine to me, so I think it is a bug.
Oh really? That's weird. Here in Italy we've always been taught that the adverb goes after the verb to be and before all the other verbs.
Ποιος γενικά είναι πράσινο; Δύολινγο, φυσικά...
Shouldn't "generally they are green" be correct as well since ειναι is both singular and plural?
Πράσινο is only singular, though. They are green would be είναι πράσινα (for neuter nouns)/ πράσινοι (for masculine nouns)/ πράσινες (for feminine nouns).
Ah, yes, true. Thank you!