I wonder how learners communicate with each other without the knowledge of words and phrases, grammar and structures. It depends on the teacher's how-to, it's not always. Effective communication is sought. Drilling is a central technique. Drilling may occur, but peripherally.
Comprehensible pronunciation is sought.
Grammatical explanation is avoided. Any device which helps the learners is accepted - varying according to their age, interest, etc. Communicative activities only come after a long process of rigid drills and exercises. Attempts to communicate may be encouiraged from the very beginning. The use of the student's native language is forbidden.