Option to Report lessons you do not understand.
On the ¨Report" screen, I wish there was an option to report ¨I know my answer is not correct, but I don´t understand WHY my answer is not correct.¨ This could allow the developers to understand which wrong answers are caused by lack of understanding (as opposed to simple mistakes) and offer explanations at the point they would be helpful.
Or like "MARK this sentence" as difficult and put it into a "discuss with tutor" or "saved difficult sentences" tabs (or both).
I often have the feeling that I would like to make use of discussion a sentence because of some specific complexity with a tutor - like with a Plus feature when I still have no idea from the "sentence discussion" (reading previous comments, not understanding their posted alternative solutions or when I have no clue how I should formulate my question in the discussion).
I really miss a advanced feature like this on Duolingo AND Memrise.
Memrise often shows me practical sentences / phrases but I do not always 100% understand the shown grammar or introduced complexity.
I think "Follow discussion" option in the sentence is doing that, in a good-enough manner. Keep in mind there are no payd moderators in this community. To put such an option to sentences for all users means to give a strong tool to harrassers of moderators and contributors. The Plus sign is not a guarantee that the owner is a kind and educated person. Also, perhaps a little personal research when you don't understand something will help you to grow up. A course with personal tutor is never free or almost free.