Okay, I may be wrong here, but several times, I've been working through Lesson when words and their conjugations have been introduced without first showing an example of their meaning (by highlighting them in orange).
While I can't think of previous examples, three have happened since yesterday — among others — that are making Prepositions almost impossible.
"De", "Por qúe" and "Parra qúe".
Prepositions is hard enough as it is without having to guess at an answer.
I've just tried a practice and hit "Whose is the coat?" as the first question. Yet because I still haven't seen a guide on this, I have no idea how to construct the translation.