What To Do When You Teach ESL & Don’t Speak The Language?

So, have you ever taught English as a Second Language (ESL) to students without knowing their native language? How often have you had students whispering in their mother tongue, or switching between it and English when working in groups in class?  

http://www.teflexchange.com/what-to-do-when-you-teach-esl-and-dont-speak-the-language/