An adverbial clause is part of a complex sentence. Although it is sentential in form, its function is adverbial. In this section, we will describe adverbial clauses expressing condition of the main event (SYNTAX 3.5.1), time (SYNTAX 3.5.2), location (SYNTAX 3.5.3) manner (SYNTAX 3.5.4), reason (SYNTAX 3.5.5), purpose (SYNTAX 3.5.6), and concession (SYNTAX 3.5.7).