Mobile app suggestion
First of all I would like to thank the Duolingo mobile app team for creating such a wonderful app. It truly is one of the most well designed ones I've seen, interface-wise.
I've got a suggestion for the exercises where you tap words to form a sentence. I'd like it if I could move words around in the sentence part (where words appear that you have tapped already). At the moment you'd have to clear one or more words if you want to change the order. Making them so that you can move/swap them around would save some time on the exercise.
For some exercises the translation isn't shown after the check, it would be great if a translation was shown regardless of which exercise it is.
Keep up the good work guys, we love you!