短語詞組短語function of word 字函數classical function word 文言虛詞Function word mistake 虛詞錯誤semi -function word 半虛化double -function word 體用同形haha function word 功能詞function word system 虛詞系統Uighur function word 維吾爾語虛詞japanese function word 日語助動詞 返回 function word