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 As a relative pronoun, "which" introduces a relative clause (also called an adjective clause) that provides additional information about a preceding noun or noun phrase. The crucial distinction here is whether the information is essential (restrictive) or non-essential (non-restrictive) to the meaning of the sentence. A. Non-Restrictive Clauses (Non-Essential Information) This is the most common and generally accepted use of "which" in American English. Purpose: The clause introduced by "which" provides extra, non-essential information about the noun. If you remove the clause, the main meaning of the sentence remains clear. Punctuation: Non-restrictive clauses are always set off by commas . If the clause is in the middle of the sentence, it will have a comma before and after it. Refers to: Typically refers to things or animals , not people. Example: "My car, which is a blue Ford Focus , was stolen last week." (The information ...

 Adjective clauses, also known as relative clauses, are a vital part of English grammar that add descriptive detail to sentences. Here's a comprehensive overview: Core Function: An adjective clause functions like an adjective, modifying a noun or pronoun. It provides additional information about the noun it modifies, making the sentence more specific. Key Components: Relative Pronouns: These words introduce adjective clauses. Common relative pronouns include: who (for people) whom (for people, in object position) whose (for possession) which (for things and animals) that (for people, things, and animals) Relative Adverbs: Sometimes, adjective clauses are introduced by relative adverbs: where (for places) when (for times) why (for reasons) Subject and Verb: Like all clauses, adjective clauses contain a subject and a verb. Types of Adjective Clauses: Defining (Restrictive) Clauses: These clauses provide essential information that identifies o...