According to Michael Swan, when teaching grammar,
we should reject nothing on doctrinaire grounds:
* deductive teaching through explanations and examples,
* inductive discovery activities,
* rule-learning,
* peer-teaching,
* decontextualised practice,
* communicative practice,
* incidental focus on form during communicative tasks,
* teacher correction and recasts,
* grammar games,
* corpus analysis,
* learning rules and examples by heart
— all of these and many other traditional and
non-traditional activities have their place, depending on the point being taught, the learner and the context.
Source: TEACHING GRAMMAR – DOES GRAMMAR TEACHING WORK? (Modern English Teacher 15/2, 2006)