What to teach:
1. sound-form-meaning link
2.homophone 同音异形/异义 e.g.fare vs.fair (可出这样的练习,锻炼学生)
3.homonymy and polysemy 同形异音/义
4.word families 同义异形
4. word-formation
e.g. prefix/suffix
5compound
e.g.classroom
multi-word unit
e.g.idiomatic expressions
横向组合关系:collocation....
纵向聚合关系:synonym, antonym...