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Let's analyze each sentence to identify whether it contains an adjective clause, adverb clause, or noun clause. We'll also determine what word each clause modifies (if applicable).

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1. If the manager is unable to help, try the assistant manager.

- Clause: *If the manager is unable to help*
- Type: Adverb clause
- Function: It tells when to try the assistant manager.
- Modifies: The main verb "try" — it gives a condition under which the action should happen.
- ✔ Explanation: "If..." introduces a conditional adverb clause that modifies the verb "try."

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2. The mayor is the person to whom you should write the letter.

- Clause: *to whom you should write the letter*
- Type: Adjective clause
- Function: Describes which person the mayor is.
- Modifies: The noun "person"
- ✔ Explanation: "Whom" is a relative pronoun referring back to "person." This clause defines or describes "the person," making it an adjective clause.

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3. The man whose neck was broken has recovered completely.

- Clause: *whose neck was broken*
- Type: Adjective clause
- Function: Describes which man is being referred to.
- Modifies: The noun "man"
- ✔ Explanation: "Whose" is a possessive relative pronoun linking the clause to "man." It specifies which man — the one with the broken neck.

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4. The scientist said that the ozone levels were dangerous.

- Clause: *that the ozone levels were dangerous*
- Type: Noun clause
- Function: Acts as the direct object of the verb "said."
- Modifies: The verb "said" — it tells what was said.
- ✔ Explanation: "That..." introduces a complete thought (subject + verb) and functions as a noun in the sentence — specifically, the object of "said."

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5. The city council objected when the mayor changed his mind.

- Clause: *when the mayor changed his mind*
- Type: Adverb clause
- Function: Tells when the city council objected.
- Modifies: The verb "objected"
- ✔ Explanation: "When..." introduces a time adverb clause that explains the timing of the objection.

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✔ Final Answers:

| Sentence | Clause | Type | Modifies |
|--------|--------|------|---------|
| 1 | If the manager is unable to help | Adverb clause | try (tells when/under what condition) |
| 2 | to whom you should write the letter | Adjective clause | person |
| 3 | whose neck was broken | Adjective clause | man |
| 4 | that the ozone levels were dangerous | Noun clause | said (acts as direct object) |
| 5 | when the mayor changed his mind | Adverb clause | objected (tells when) |

Let me know if you'd like these explained in simpler terms or with diagrams!