I've just started living in France and so use this on the train to work every morning, as it was recommended by a friend who herself learnt using these books (but not only these books, theyre a supplement but I imagine impossible for learning completely). The books use no other language but French even for instructions which I think's helpful because it forces you to think this way and it extends your vocabulary, but I would have liked to have known that corrections (corrigés) must be bought separately. It's good practice but unless you know if anything you're doing is right you might very well just be getting well practised at the wrong thing. I've ordered the corrections/answers but think it'd be nicer if you could purchase the two as a pack (I understand one book would be pretty thick and not practical).