Dear Duolingo: What's the right level of difficulty?
Dear Duolingo: Is immersion the best way to learn a language?
What are the most common mistakes French learners make?
Querido Duolingo: ¿cómo sé qué sonidos hacen las letras en francés?
How French accent marks can help improve your pronunciation
by Sharon Wilkinson and Cindy Blanco
Learning