English as a second language; ESL; TESOL ; Strategy (speech perception) ; Strategie (Sprachperzeption) ; Listener strategy ; Metalinguistic awareness; Phonologische Bewusstheit; Phonological awareness; Focus on form (language teaching) ; Sprachbewusstsein; Linguistic awareness ; Speaker strategy ; Singapur (engl. Sprache in) ; Singapore (English language in) ; Singlish; English in Singapore