【摘要】 关于语气词"吧"有多种说法，但仍有一些语言现象无法解释，原因在于归纳意义时忽略了用法的考察或考察得不全。实际上"吧"只作用于一个非疑问形式，其作用是附在判断式或祈使式上，缓和句子的语气。根据语气词不同的作用域，可以建立一个语气词系统。更多还原

【Abstract】 Althoug there have been a lot of interpretations on ba’s meaning, some ligustic facts still elude explanation due to the lacking or unsufficient observation of its usage. Ba functions, in fact, only whithin a non - interrogative form.Attached to an imperative form or a form of judgement, ba can soften the mood of the sentence. According to their different functional re- gions,we can build up a new system of the modal particles.更多还原