17. In which sentence is the word but used as a preposition?

A. John liked baseball but not football.
B. We would like to visit the Grand Canyon, but our vacation time is up.
C. Children should be seen but not heard.
D. None but the brave shall enter in.

A prepositional phrase begins with a preposition and ends with a noun or pronoun. It does not contain a verb.

What do you think the answer? Actually there are two correct answers.

To determine which sentence uses the word "but" as a preposition, we need to understand the role of "but" in each sentence.

A. In the sentence, "John liked baseball but not football," "but" is used as a conjunction to join two clauses. It is not used as a preposition.

B. In the sentence, "We would like to visit the Grand Canyon, but our vacation time is up," again "but" is used as a conjunction to connect two clauses. It is not used as a preposition.

C. In the sentence, "Children should be seen but not heard," the word "but" does not function as a preposition. It is used as a conjunction to link two phrases.

D. In the sentence, "None but the brave shall enter in," "but" is used as a preposition to indicate exclusion or exception. Here, it is used in a prepositional phrase where "the brave" is the object of the preposition "but."

Thus, the correct answer is D. None but the brave shall enter in.