More on PRONOUN CASES
To answer Wataya's email question to me: The German sentence was "Du bist ebenso gut wie sie". I knew that the second pronoun could be either singular or plural, but chose the singular and answered: "You are just as good as she" - implying "---as she is". Duolingo said I was wrong; that the answer should be "You are just a good as her (or them)". But that puts the pronoun into the wrong case (Akkusativ). "Du" is Nominativ and so should "sie" be, as the sentence is comparing two subject entities. I know that Americans are sloppy with grammar and probably would say “You are just as good as her”. But I think Duolingo should go with the grammatical answer.