how am I supposed to know this if it never gets presented before? either I take a guess mainly based on the suggestions available or I cheat by hoovering over the word? wouldn't it be better to introduce new words while doing exercises about things we know already? it's frustrating to be given "error" because I don't cheat or because I am forced to take a guess. plus knowing that when on the app I can't even access the tips before the lessons.... it's free, I know, and I like it and i am thankful but after more than 2 years can you not put the tips available also on the app, Duolingo?