There are a few phrases in your target language that you should have handy, either memorized on the tip of your tongue, or on a “cheat-sheet” (perhaps a text file on your computer). If you don’t know them now, then you can ask your teacher at the start of the lesson. Using these phrases will enable you to stay in your target language even if you run into issues:
Could you please repeat that?
Please don’t speak to me in English.
Could you please say that in another way?
Could you please speak a little more slowly?