Rationale
Bird is a noun in the sentence.
In the provided sentence, "The bird flew across the blue sky," the word "bird" functions as a noun, representing a person, place, thing, or idea. Nouns serve as the subjects or objects within a sentence, making them essential for conveying meaning.
A) across
"Across" is a preposition that indicates the position or direction of the action. It connects the verb "flew" to the noun "sky" but does not represent a person, place, thing, or idea and therefore cannot be classified as a noun.
B) flew
"Flew" is a verb that describes the action performed by the subject "bird." It indicates the past tense of the action of flying. Since verbs denote actions rather than nouns, "flew" does not qualify as a noun in the sentence.
C) bird
"Bird" is a noun that refers to a type of animal. It serves as the subject of the sentence, performing the action of flying. As a concrete noun, it represents a specific entity within the context of the sentence.
D) blue
"Blue" is an adjective that describes the noun "sky." It provides information about the color of the sky but does not itself represent a person, place, thing, or idea, thus it cannot be classified as a noun.
Conclusion
In the sentence "The bird flew across the blue sky," the word "bird" is the only noun, fulfilling the role of the subject. The other options—across, flew, and blue—serve as a preposition, verb, and adjective respectively, illustrating diverse grammatical functions but not qualifying as nouns. Understanding these distinctions is crucial for analyzing sentence structure and identifying parts of speech effectively.
