A final clause in linguistics is a dependent adverbial clause expressing purpose. For this reason it is also referred to as a purposive clause or a clause of purpose. A final clause in linguistics is a dependent adverbial clause expressing purpose. For this reason it is also referred to as a purposive clause or a clause of purpose. In English, final clauses are relatively rare. A final clause is a reply to a question containing the question word wherefore or what for (sometimes also why). The prescription for their construction is rather complicated: A final clause is introduced by the following linking words (conjunctions):