This article aims to provide an analysis for a curious fact about reduced relative clauses in Standard English: while full relative clauses permit all forms of inflection, reduced relative clauses are restricted to passive and progressive inflections. This puzzle is explained by claiming that, while full relative clauses are comprised of both phases of the clausal spine, reduced relative clauses are comprised solely of the clause‐internal phase. Following the claim that the clause‐internal phase in English in fact extends as far as the progressive aspectual layer (Harwood 2013, 2015; Wurmbrand 2013, 2014; Ramchand & Svenonius 2014; Aelbrecht & Harwood 2015) this fully accounts for the inflectional restrictions on reduced relative clauses in Standard English.

中文翻译：

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简化关系和扩展阶段：英语简化关系从句屈折限制的基于阶段的分析

本文旨在对标准英语中简化关系从句的一个奇怪事实进行分析：虽然完整关系从句允许所有形式的变化，但简化关系从句仅限于被动和进行变化。这个难题的解释是，虽然完整的关系从句由小句主干的两个阶段组成，但简化的关系从句仅由从句内部阶段组成。继声称英语中的从句内部阶段实际上延伸到渐进方面层（Harwood 2013, 2015; Wurmbrand 2013, 2014; Ramchand & Svenonius 2014; Aelbrecht & Harwood 2015）之后，这充分说明了减少标准英语中的关系从句。