Understanding the Passage and Fill-in-the-Blank Question

The provided passage discusses the definition and characteristics of a phrase compared to a clause. It describes a phrase as a group of words representing a single idea that plays a specific role in a sentence. The first blank requires a word to complete the description of what this "single idea" does.

Analyzing the Blank and Options

The specific part of the sentence we are focusing on is: "a single idea that _________ a separate part of a sentence."

The subject of the verb in this clause ("that _________ a separate part...") is "that", which refers back to "a single idea". "A single idea" is a singular subject.

We need a verb that agrees with a singular subject ("a single idea" or "that") and fits the context of describing the function of the idea within the phrase.

Let's look at the options:

• form: This is the base form of the verb, typically used with plural subjects (e.g., "ideas form") or in specific grammatical structures (e.g., imperative, subjunctive).
• forms: This is the third-person singular present tense form of the verb "to form", used with singular subjects like "he", "she", "it", or "a single idea".
• formation: This is a noun, meaning the process or act of forming something, or the way something is formed. It is not a verb.
• forming: This is the present participle or gerund form. It can be part of a continuous verb tense (e.g., "is forming") or function as an adjective or noun, but it doesn't fit directly after "that" as the main verb describing a characteristic here.

Applying Subject-Verb Agreement

The subject is "a single idea", which is singular. In the present tense, a singular subject requires a verb ending in "-s" (for most verbs). The structure "that _________ a separate part" requires a verb to describe the action of the idea.

Comparing the options with the requirement for a singular present tense verb:

• "form" is plural. Incorrect.
• "forms" is singular present tense. Correct.
• "formation" is a noun. Incorrect.
• "forming" needs a helping verb or different sentence structure. Incorrect.

Therefore, the word that correctly completes the sentence and agrees with the singular subject "a single idea" is "forms". The phrase "a single idea that forms a separate part of a sentence" correctly describes the function of the idea within the phrase.

Final Answer Derivation

Based on subject-verb agreement rules for singular subjects in the present tense, the word "forms" is the only option that correctly fits the blank "a single idea that _________ a separate part of a sentence."

Revision Table: Analyzing the Options

Additional Information: Phrases vs. Clauses

Understanding the difference between a phrase and a clause helps in analyzing sentence structures like the one in the passage.

• Phrase: A group of words that functions as a single unit within a sentence but does not contain both a subject and a verb that are performing an action together. Examples: "in the park", "with great enthusiasm", "the big red car".
• Clause: A group of words that contains both a subject and a predicate (a verb and its objects/modifiers). Clauses can be independent (a complete sentence) or dependent (cannot stand alone as a sentence). Examples: "he ran", "because it was raining", "which is on the table".

The passage correctly highlights that a phrase denotes a single idea and forms a separate part of a sentence, while a clause is like a short sentence itself, forming a distinct part of a larger composition.