English as a second language; ESL; TESOL ; Idioms (language teaching) ; Phraseologie; Idioms; Phraseology ; Idiomatik, kontrastive; Idioms (contrastive analysis of) ; Contrastive analysis of idioms ; Kulturvergleich; Language and culture ; Comparison ; Theory of metaphor ; Metaphorik, kontrastive; Metaphors (contrastive analysis of) ; Contrastive analysis of metaphors ; English