Thanks, yeah now I just use Duolingo for the memorization of words amd phrases on the German course. And yeah it should have lessons on tenses, articles and conjugations, but it doesn't, that's why I have a book.

Thanks for explaining "sein" better, now I think I understand it more. And thanks for explain "wart" to me, that helps a lot. Amd no I don't recall learning about "vosotros" in my Spanish class, maybe we covered it, I can't remember.