Question

Identify the function of the phrase contained in the following sentence.

The best topic to write about is one you know well.

Answer 1

if it is "the possibility of black holes", then the answer is "direct object". "Many scientists" is the subject, there is no "predicate noun" because there is no linking verb here, there are no adverbs in this sentence, nor adjectives, and the object of a preposition would be "black holes", because it follows a preposition OF.

Answer 2

Infinitive phrase as an adjective.

Step-by-step explanation:

An Infinitive phrase is a group of words that is used in an infinitive way in a sentence as an adjective, noun, and adverb.

When an infinitive phrase is used as an adjective in a sentence they help to modify the nouns.

In the given sentence, the infinitive phrase is working as an adjective as it is modifying the noun, topic.

So, the correct answer is infinitive phrase as an adjective.