Morphosyntax knowledge was measured by a 112-item grammaticality judgment test, which included 84 sentences from Johnson &Newport (1989) and 28 sentences from White &Genesse (1996).

• 语音测验的程序为让所有受试者朗诵一篇英文短文，然后再请五位英文母语人士评断所有受试者的发音。