Commentary: When the Easy Becomes Difficult: Factors Affecting the Acquisition of the English /iː/-/ɪ/ Contrast and On the Difficulty of Defining “Difficult” in Second-Language Vowel Acquisition

New Research: Commentary: When the Easy Becomes Difficult: Factors Affecting the Acquisition of the English /iː/-/ɪ/ Contrast and On the Difficulty of Defining “Difficult” in Second-Language Vowel Acquisition https://t.co/bgxKOiFa14