An infinitive phrase is a group of words introduced by "an infinitive", This group of words may function as a noun, adjective or adverb. In the following example the infinitive phrase is working as an adjective, since it modifies the noun "topic".
<em>The best </em><u><em>topic</em></u><em> </em><u><em>to write about</em></u><em> </em><em>is one you know well.</em>
<em> noun infinitive phrase</em>
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1 : to express sorrow audibly2 : to make a sound suggestive of a mournful cry3 : to express dissatisfaction plaintively
<span>The correct answer is A. An interrogative pronoun is most likely used to introduce a question. The word "interrogative" means "relating to a question," so an interrogative pronoun must be a pronoun that relates to a question. Remember that interrogative pronouns are what, which, who/whom, and whose. These pronouns are used to ask questions. For example: Which book is mine? Who is at the door? What time do we have to leave? </span>
