In the Audio-lingual method, the teacher is like an orchestra leader, directing and controlling the language behaviour of her/his students. Teachers are responsible for providing her/his sts. with a good model for imitation.
In contrast, in the Communicative Approach the teacher is a facilitator of his students´ learning. He´s a manager of classroom activities. One of his major responsibilities is to establish situations likely to promote communication. He acts as an advisor, answering student´s questions and monitoring their performance.