This document discusses adverbial subordinate clauses, which provide adverbial information like how, when, or why to the main clause. It covers:
1. Adverbial clauses introduced by subordinators that establish the relationship between the main and subordinate clause, including clauses of time, manner, cause, result, and concession.
2. Free adjuncts that provide adverbial information without subordinators in terms of time, reason, instrument, or condition.
3. Problems English language learners face with adverbial subordinate clauses, such as distinguishing uses of subordinators.