"Natürlich werde ich mich auch eintragen."
This seems to be a beta version. Every sentence I write, while it has the same meaning, is marked wrong.
I agree, and it IS a beta version as far as I know. So I get a lot of frustration too, but I am still awed by the level of expertise this software has already achieved. And the staff is quick with working our suggestions in.
Oh, I agree. It's an amazing program, it is continuously updated, based on all the feedback I'm getting from Duolingo, and I'm addicted to it! :-)