Second language acquisition (language teaching) ; Zweitspracherwerb (Unterricht) ; Foreign language teaching ; Critical period (language acquisition) ; Alter (Einfluss auf Spracherwerb) ; Age (influence on language acquisition) ; Age of acquisition; AoA; Sensitive period (language acquisition) ; Acceptability (second language acquisition) ; Phonische Interferenz; Languages in contact (phon.) ; Sprachkontakt (phon.) ; Interference (phon.) ; Holländisch; Dutch