Ellipsis of a constituent whose head has moved out of it (“headless ellipsis”) is possible in some cases but not in others. Headless ellipsis is licensed only if the stranded head has not crossed a Spell-Out domain. The reason is that the silencing instruction responsible for ellipsis must be PF-visible on the head of the elided constituent, and PF-visibility is cut off at Spell-Out domain boundaries. A parallel effect is observed with remnants of head movement that are frozen for movement (“headless movement”). The two effects can possibly be united if ellipsis and copy deletion recruit the same silencing instruction at PF, hosted on the head of the deleted constituent. A third, mirror-image effect is observed with reprise fragments, which must be visibly headed. This time head movement removes the PF instruction that spares these fragments from ellipsis. Overall, these phenomena establish the significance of headedness for the syntax-PF interface.

中文翻译：

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约束头绞椭圆

在某些情况下可能会出现椭圆移出其头部的情况（“无头省略号”），而在其他情况下则不可能。仅当绞合的头未穿越Spell-Out域时，才许可无头省略号。原因是负责省略号的消隐指令必须在被淘汰组成部分的头上是PF可见的，并且PF可见性在Spell-Out域边界处被切断。观察到头部运动的残余物被冻结以进行运动（“无头运动”）时，会产生类似的效果。如果省略号和副本删除在PF上征用了相同的沉默指令（托管在已删除成分的头部），则这两种效果可能会统一。用重复片段观察到第三种镜像效果，该片段必须清晰可见。这次头部移动将删除PF指令，该指令免除了省略号中的这些片段。总体而言，这些现象为语法-PF接口确立了首标的意义。