Leech (1994) in his analysis of the ‘mature communicative knowledge’ of grammar required by the teacher. According to Leech, the ‘model’ teacher of languages should be able to put across ‘… a sense of how grammarinteracts with the lexicon as a communicative
system …’ and ‘… be able to analyse the grammatical problems that learners encounter’. At the same time, such a teacher should ‘… have the ability and confi- dence to evaluate the use of grammar, especially by learners, against criteria of accuracy, appropriateness and expressiveness’, and ‘… be aware of the
contrastive relations between native language and foreign language’. Lastly, the
‘model’ teacher should ‘… understand and implement the processes of simplifi- cationby which overt knowledge of grammar can best be presented to learners at different stages of learning’ (Leech, 1994: 18)