This second volume on The Foundations of Arabic Linguistics contains contributions from the second conference on Arabic linguistics, hosted by the University of Cambridge in 2012.All contributions deal with the grammatical theories formulated by the first grammarian to write a complete survey of the Arabic language, Sībawayhi (died at the end of the 8th century C.E.). They treat such topics as the use of hadith in grammar, the treatment of Persian loanwords, the expression of modality, conditional clauses, verbal valency, and the syntax of numerals. Contributors are: Georgine Ayoub, Michael G. Carter, Hanadi Dayyeh, Jean N. Druel, Manuela E.B. Giolfo, Almog Kasher, Giuliano Lancioni, Amal Marogy, Arik Sadan, Beata Sheyhatovitch, Cristina Solimando, and Kees Versteegh.