Since natural languages exist in two different modalities - the visual-gestural modality of sign languages and the auditory-oral modality of spoken languages - it is obvious that all fields of research in modern linguistics will benefit from research on sign languages. Although previous studies have provided important insights into a wide range of phenomena of sign languages, there are still many aspects of sign languages that have not yet been investigated thoroughly. The structure of subordinated clauses is a case in point. The study of these complex syntactic structures in the...