Word一yīMeaningonePart of speechnumeralPronunciationCourseHardcore ChineseLessonLesson 2Usages of yī我wǒ 有yǒu 一yì 本běn 书shū,那nà 本běn 书shū 是shì 我wǒ 的de。wǒ yǒu yì běn shū,nà běn shū shì wǒ de.I have a book; that book is mine.