A clause is a grammatical unit that includes a subject and predicate. It expresses a proposition, which is the constant meaning despite changes to things like voice or force. There are two main types of clauses: main clauses and subordinate clauses. Subordinate clauses are embedded in a main clause and function like a noun, adjective, or adverb. Noun clauses function as subjects, direct objects, indirect objects, or objects of prepositions. They are introduced by words like that, what, who, whichever.
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