Melani Wratil & Peter Gallmann 
Null Pronouns [PDF ebook] 

Most natural languages display an inventory of pronominal elements that obligatorily or optionally remain phonologically null in a few, in many or even in all syntactic surroundings. The authors of the papers compiled in this book analyse such null pronouns in a synchronic and diachronic way and recover the specific morphological and syntactic prerequisites for their origin and insertion.

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