ABSTRACT: This paper focuses on declarative sentences to demonstrate how four major concepts: changeability, actuality, durationality and telicity, work together in shaping Chinese finite clauses. In the Chinese lexicon there are changeable and unchangeable verbs distinguished by the latter's inability to co-occur with aspect particles in a finite clause. The changeable declaratives are further divided into two kinds: durational and nondurational, as the latter cannot occur alone without either the perfective le 1 in realis, or a modal auxiliary. Moreover, the durational declaratives can occur in either irrealis modality negated by bù or realis modality negated by měi(yǒu) . The declarative sentences for durational events are linguistically distinct in terms of telicity: the progressive zài and imperfective zhe are atelic, and the perfective le 1 and experiential guo are telic. Just like other world languages as was noted by Givón (1995, 2001), Chinese finiteness is also characteristically gradient, with the least finite forms functioning like a noun and the most finite forms functioning as a declarative sentence with an obligatory aspect particle. 摘要: 汉语定式句为陈述句，有四个特征：可变、实现、持续和终结。作为 陈述句，可变类受词汇限制，不可变动词可直接完句，但不可带体 词。可变类分持续和不可持续两类。不可持续的动词无情态助词或完 成体标记时不能单独完句。持续类又可分为现实和非现实两类，非现 实类否定用"不"，现实类否定用"没(有)"。现实类的标志为四个 体标记：非终结性的进行体"在"和非完成体"着"以及终结性的经 验体"过"和完成体"了1"。根据Givón (1995, 2001)的理论，具有上 述特征的汉语定式系统是一个连续统，一端为作名词用的不定式通用 动词，中间为非现实定式陈述句，另一端为动词带有体标记的定式 陈述句。