This paper is concerned with the internal syntax of parentheticals in German. I argue that, despite superficial appearance, parentheticals form a categorially homogeneous class with respect to their category, namely they are clausal (i.e. CPs) throughout. To derive the fact that parentheticals show up as various categories at the surface, I adopt a movement plus deletion approach that assimilates parentheticals to other phenomena analysed as ellipsis, such as sluicing, fragment answers, split questions, amalgams, left and right dislocation. Moreover, I propose that appositions and parentheticals are one and the same phenomenon and thus should be captured by the same approach.The first evidence for the clausal hidden structure of parentheticals comes from two observations. To begin with, there are certain elements which are usually assumed to depend on the presence of a C-projection and which can appear within parentheticals. This suggests an underlying clausal structure. The observation will be illustrated by means of sentence adverbs and discourse particles in 2.1. (4) is also briefly mentioned in Döring (2010). An approach in terms of movement and deletion was touched upon in Döring (2012). Earlier related discussions can be found in
Hypothesis
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