Pronunciation (teaching of) ; English as a second language; ESL; TESOL ; Lautperzeption (Zweitspracherwerb) ; Lautentwicklung (Zweitspracherwerb) ; Phonetik (Zweitspracherwerb) ; Phonemik (Zweitspracherwerb) ; Phonologie (Zweitspracherwerb) ; Sound perception (second language acquisition) ; Phonetics (second language acquisition) ; Phonology (second language acquisition) ; Artikulation (Zweitspracherwerb) ; Articulation (second language acquisition) ; Second language acquisition (phon.) ; Critical period (second language acquisition) ; Alter (Einfluss auf Zweitspracherwerb) ; Age (influence on second language acquisition) ; Ultimate attainment (second language acquisition) ; Near-native competence (second language acquisition) ; AoA; Age of acquisition (second language acquisition) ; Sensitive period (second language acquisition) ; Speech intelligibility (second language acquisition) ; Subject-auxiliary inversion; SAI; Stylistic inversion ; English