Lots of mistakes
Many errors in the questions, as they jump to English and then have odd syntax and errors...makes it hard to complete lessons.
Especially in the advanced French lessions. The lesson on subjunctive phrases was the worst!
There are lots of grammatical and syntax errors in the English answers in the Spanish lessons (I lost a heart because Duolingo said the English translation of a sentence was something like "They has a pair of shoes", for example. Frustrating!