In this paper we consider how corpora may be of use in the teaching of grammar of the pre-tertiary level. Corpora are becoming well established in teaching in Universities. Corpora also have a role to play in secondary education, in that they can help decide how and what to teach, as well as changing the way in which puplis learn and providing the possibility of open-ended machine-aided tuition. Corpora also seem to provide what UK goverment sponsored reports on teaching grammar have called for – a data-driven approach to the subject.