This article on information gaps will show you how to teach grammar using the Communicative Approach by integrating a grammar lesson with a speaking skills lesson.
Why do Information Gaps?
An information gap activity is an ideal activity to simulate authentic conversations. This type of activity requires learners to use their second language in order to discover some piece of information that their partner or other group members have. This is after all why we converse: to share information.
An information gap can be used in the practice or productive stage of a grammar lesson to re-enforce a pre-taught grammatical feature. It can also be used to review grammar, or used in a speaking class to engage learners in conversations with a communicative purpose.