It comes as no surprise to find Duolingo has such a bad review history _ In my experience over the last two years_ it really feels as though the app / website features are suffering from a steady decline in their usefulness At the beginning_ two years ago_ before starting on a set of lessons it was possible to click a button at the top to read 'grammar tips' & 'key phrases' _ Although the key phrases are visible_ the grammar tips which are still advertised in each lesson heading_ are no longer actually available _ and contacting Duolingo about the missing grammar tips results in nothing more than an automated response_ compared to two years ago when queries received a human reply Automation is everywhere these days_ we all know this _ But when there are multiple errors to the audio test questions (even when I've asked native speakers to try them and who have also failed these tests) Duolingo's automated system repeats the same audio test question over and over again _ which means it's impossible to complete the whole lesson_ except by deleting your previous answers and moving on with the lesson not completedObviously deleting your lesson progress is unhelpful and very discouraging _ But sadly_ once again_ there is no longer anything more than an automated response from Duolingo about these failures I could go on... and all my complaints about Duolingo are evidence-based _ At the end of the day my only suggestion is that this automated learning system is degrading in its usefulness and gradually failing_ which is very unfortunate Based on my experience over an extended period_ I have concluded that trying to continue learning a language via Duolingo is a waste of my time and even a waste of my money when I invested in Duolingo Plus (in the hope that this might improve the system's performance or at least generate more than an automated response) I'm going to find another way to learn a language _ Without hesitation I'd advise anyone reading this review to do the same