exam

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Certainly! Here's a concise set of notes to study the main distinctions between restrictive and nonrestrictive adjective clauses:

**Restrictive Clauses:**

- **Definition:** Essential for identifying the noun; without the clause, you wouldn't know which specific person/thing the sentence refers to.

- **Examples:**

- "The professor who teaches Physics III is excellent."

- "The woman you met at my party is a former astronaut."

- **Function:** Defines the nouns; required for identification.

- **Commas:** **Not used** with restrictive clauses.

**Nonrestrictive Clauses:**

- **Definition:** Provides extra information about a noun already fully identified; not crucial for identification.

- **Examples:**

- "Professor Edwin García, who teaches Statistics, is an excellent professor."

- "Justin Brown, whom you met at my party, is a former astronaut."

- **Function:** Adds extra details but does not define the nouns.

- **Commas:** **Required** with nonrestrictive clauses.

**Commas Usage:**

- **Restrictive Clauses:** No commas because they provide essential information for identification.

- e.g., "The professor _who teaches Physics III_ is excellent."

- e.g., "The woman _you met at my party_ is a former astronaut."

- **Nonrestrictive Clauses:** Commas are used to set off the clause, indicating it provides nonessential information.

- e.g., "Professor Edwin García, _who teaches Statistics_, is an excellent professor."

- e.g., "Justin Brown, _whom you met at my party_, is a former astronaut."

**Summary:**

- **Restrictive Clauses:** No commas, essential for identification.

- **Nonrestrictive Clauses:** Commas required, provide additional, nonessential details about already identified nouns.

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