Resources/Pinyin/ Pinyin Basic Pinyin System Standard-Pinyin1 Standard-Pinyin2 Standard-Pinyin3 Pinyin Practice Pinyin-Practice1-initials Pinyin-Practice2-a ai ao an ang Pinyin-Practice3-e ei en eng er Pinyin-Practice4-i Pinyin-Practice5-o Pinyin-Practice6-u Tone Practice 1 Tone Practice 2 Tone Practice 3 Tone Practice 4 hide/show left list Standard-Pinyin1