Teachers need to use their native language at all times. Who teaches various techniques to help students understand. Techniques such as dumb (mime) using body language (body language) and so on.
The instructor must use the language of native speakers at any time. Instructors use different techniques to help students understand, such as "dumb tricks (mime) using language, posture (body language), etc.
The teacher must use the language of the owner at all times the language teaching techniques to help students to understand, such as The technical term dumb (MIME), the use of language gestures (body language), for example.