The way a flipped class works is that you provide your students with the lecture material and examples that would have normally been delivered by the teacher in the classroom. Students are then prepared to practice those lessons in the form of project work, discussions or other activities the teacher has prepared.
This method requires the student to spend more time working with the language than they otherwise might have. They are required to look over the lesson notes in preparation for the class-time activities. The result is faster language acquisition and improved confidence in students.