Which phase defines an appositive?

The phase that defines an appositive is called the appositive phrase. An appositive is a noun or noun phrase that renames or identifies another noun right beside it. It provides additional information about the noun it renames or identifies. To identify the appositive phrase, here are the steps you can follow:

1. Look for a noun or noun phrase in the sentence.
2. Check if there is another noun or noun phrase placed right beside it, usually separated by commas.
3. If there is, that noun or noun phrase is the appositive, and the phrase as a whole is the appositive phrase.

For example, in the sentence, "My dog, a golden retriever, loves to play fetch," the appositive phrase is "a golden retriever," which renames the noun "dog."