This monograph deals with argument drop in the German prefield and it presents new insights into null subjects, topic drop and the interpretation of topic dropped elements. Major issues are (inter alia) the drop of structurally vs. obliquely cased arguments and the question on which basis nominative/accusative and dative/genitive can be kept apart. Furthermore, it is shown that the (im)possibility of phi-feature mismatches concerning the antecedent and gap in topic drop dialogues allows to differentiate between coreference and "real" (quantifier) binding. Aside from topic drop, (1st/2nd...