A clause is a section or part of a sentence that contains a subject and a verb. Complex sentences are made up of a series of clauses. The main clause (or clauses) is the part of a sentence that makes sense on its own and does not depend on any other element in the sentence. A subordinate clause always depends on another clause, and is often introduced by a conjunction such as che. There are different types of subordinate clause, for example: relative clauses, Ho visto il ragazzo che piace a mia sorella ‘I saw the boy that my sister likes’; or purpose clauses, Ha portato la macchina dal meccanico perché controllasse i freni ‘I took the car to the mechanic so that he could check the brakes’.