Adverbial clauses express an adverbial meaning such as reason, purpose and time, and function as modifiers of main clauses. Adverbial clauses are categorized into the following types: conditional, temporal, locative, manner, reason, purpose, concessive, substitutive, additive and absolutive.
The adverbial clause constructions that are found in TÄ°D are described in detail in the following sections. These constructions have some common properties: First, adverbial clauses obligatorily precede the main clause. Second, raised eyebrows and head thrust are non-manual markers that are used to mark both conditional clauses and temporal clauses, head thrust being the most frequent NMM across adverbial clauses. Lastly, no common non-manual markers accompany main clauses.