Romance clitics are currently accounted for as DP arguments moved to functional head positions or as functional heads (AccVoice, etc.) licensing pro-DPs in argument position. I take the view that clitics are first merged as heads, projecting independently motivated categories on the functional spine of the sentence (φP, ApplP). I argue that they can satisfy theta relations without need for a pro associate. From an empirical point of view, a pure head syntax for clitics is favoured in explaining the asymmetries between clitics and phrases, found in several syntactically relevant domains (order, agreement, case). I show how the hypothesis that clitics are functional heads derives the internal order of the clitic string, which does not necessarily match (or mirror) that of phrasal constituents. I also consider agreement asymmetries (perfect participle agreement) and case asymmetries (in relation to Differential Object Marking).

Romance clitics 目前被认为是 DP 论点转移到功能性头部位置或功能性头部（AccVoice 等）许可pro -DPs 在论点位置。我认为附着词首先被合并为中心词，将独立动机的类别投射到句子的功能脊柱上（φP，ApplP）。我认为他们可以满足 theta 关系而不需要专业人士联系。从经验的角度来看，在解释在几个句法相关领域（顺序、一致、案例）中发现的附属词和短语之间的不对称性时，有利于使用附连词的纯头部句法。我展示了附属词是功能性元首的假设如何推导出附属词串的内部顺序，这不一定匹配（或反映）短语成分的内部顺序。我还考虑了协议不对称（完美分词协议）和大小写不对称（与差异对象标记有关）。