Subordinate clauses in English perform various functions, such as specifying, expressing a reason or a condition. They can be attributive (e.g. The book that you gave me is interesting), expressing a reason (I stayed home because it was raining) or a condition (If it rains, we’ll stay inside). To connect a subordinate clause to a main clause, conjunctions such as that, which, because, if are usually used. For example, in adjective clause examples the adjective clause specifies the noun by adding additional information.