A clause is a part of a sentence. Each clause is made up of a subject (who or what the sentence is about) and a predicate (what happens in a sentence). Each predicate has only one main verb. "I love you" is a sentence which has only one clause. "I love you and I will always love you" is a sentence which has two clauses. The two clauses are "I love you" and "I will always love you". These clauses are joined together by the word "and", which is a conjunction). Clauses may be independent or dependent.