Try Language Transfer. I can’t recommend it highly enough. It is just a set of MP3 files that you listen to. The teacher explains something to the student, and the student tries it out.

It sounds silly, but it works really well, and it is the best language resource I’ve ever used.

You can use them through SoundCloud (downloadable MP3s), YouTube, or with the simple but very effective app.

It’s all free, although you are welcome to support the project with donations. I have been making a monthly donation for several years now.