In this book, Ljiljana Progovac presents cross-linguistic data on negative
polarity, reflexive binding and the subjunctive mood, and proposes a
unified analysis for various languages, including English and
Serbian/Croatian. She argues that Negative Polarity Items (NPIs), such as
'anyone' and 'ever', are anaphoric in nature and must be bound in their
governing category, while Positive Polarity Items (PPIs), such as 'someone'
and 'already', are subject to Principle B of the Binding Theory. She also
suggests that possible binders (and SUBJECTS) for polarity items are
negation or else a polarity operator in the complementiser of questions,
conditionals, and other clauses with an unfixed truth-value. Her analysis
not only captures many similarities between polarity and anaphora, but also
accounts for a number of hitherto unexplained facts about polarity items.