Needed a refresher course in French and duo lingo is a great way to learn. Using translation. Sentence structure, pronunciation and vocabulary all in a fun game like matter. Excellent app.
Recently I have used this to brush up on my Spanish. It really helped out on a visit to C.A., but often is wrong as the situation more often dictates the word usage.
That and their insistence to use the word headship and undership. Never in any English speaking country have I ever used these words. Perhaps apprentice or intern along with contractor or foreman might be better substitutes.
AppleSuxMe about Duolingo Learn Many Languages for Free, v5.0.14