1. Sometimes, you want to be alone.

(Is 'alone' an adjective or an adverb'?)

It's an adjective in this sentence.

In that sentence it is part of an infinitive phrase acting as a direct object.

To determine whether "alone" is an adjective or an adverb, we can break down the sentence and examine its role in the sentence.

In the sentence "Sometimes, you want to be alone," the word "alone" modifies the verb "be," which means it describes the state of being. In this case, "alone" functions as an adverb because it describes how someone wants to be.

Here's how you can identify whether "alone" is an adjective or an adverb:
1. Identify the word it modifies: "alone" modifies the verb "be."
2. Determine what it describes: "alone" describes the state of being.
3. Conclude its function: Since "alone" describes the verb, it acts as an adverb in this sentence.