The issue: We discuss (declarative) prepositional object clauses (PO-clauses) in the West Germanic languages Dutch (NL), German (DE), and English (EN). In Dutch and German, PO-clauses occur with a prepositional proform (=PPF, Dutch: ervan, erover, etc.; German: drauf/darauf, drüber/darüber, etc.). This proform is optional with some verbs (1). In English, by contrast, P embeds a clausal complement in the case of gerunds or indirect questions (2), however, P is obligatorily absent when the embedded CP is a that-clause in its base positionv(3a). However, when the that-clause is passivized or topicalized, the stranded P is obligatory (3b). Given this scenario, we will address the following questions: i) Are there structural differences between PO-clauses with a P/PPF and those in which the P/PPF is optionally or obligatorily omitted? ii) In particular, do PO-clauses without P/PPF structurally coincide with direct object (=DO) clauses? iii) To what extent are case and nominal properties of clauses relevant? We use wh-extraction as a relevant test for such differences. Previous research: Based on pronominalization and topicalization data in German and Dutch, PO-clauses are different from DO-clauses independent of the presence of the PPF (see, e.g., Breindl 1989; Zifonun/Hoffmann/Strecker 1997; Berman 2003; Broekhuis/Corver 2015 and references therein) (4,5). English pronominalization and topicalization data (3b) appear to point in the same direction (Fischer 1997; Berman 2003; Delicado Cantero 2013). However, the obligatory absence of P before that-clauses in base position indicates a convergence with DO-clauses. Experimental evidence: To provide further evidence to these questions we tested PO-clauses in all three languages for long wh-extraction, which is usually possible for DO-clauses in English and Dutch, and in German for southern regional varieties. For German and Dutch we conducted rating studies using the thermometer method (Featherston 2008). Each study contained two sets of sentences: the first set tested ...
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