For figurative language: It is necessary to devise specific teaching strategies for figures of thought with a strongly conventionalized lexical or constructional grounding when such conventionalization has taken different paths for L1 and L2.
For constructions: Constructions are to be taught in connection to one another in terms of family-internal and family-external similarities. For example, the English caused-motion construction is best taught in relation to sister resultative constructions since they share much of their conceptual and formal structure.