

I agree, I use Duolingo because it’s good at making me comeback to learn. But I use it for vocabulary as I feel it is best for that. It was never very good at teaching grammar.
But I don’t know why it is not good at teaching grammar. I don’t think it’s that difficult to replicate textbook exercises in a fun way. All I can think why they don’t have good grammar exercises is that it’s some dark pattern I don’t recognise.
Is that “minimum”?