Rating is available when the video has been rented.
This feature is not available right now. Please try again later.
Published on Jun 15, 2015
What does it really mean to know a language? How do you make sure, if you're a teacher, that you give your students what they need in order to acquire a language, or, if you are a learner, that you get what you need? (Hint: It's not "practice.")