My father, an expert on wildlife, is coming to my party.
1.what is the appositive in the sentence?
2.is the appositive essential or nonessential?
3.s the appositive a single noun or an adjectival phrase?
4.what is the purpose of the appositive?

1. The appositive in the sentence is: an expert on wildlife

2. It’s nonessential.

3. It is a noun phrase.

4. Provides an additional information about the sentence’s subject noun (My father).

Explanation:

An appositive is a grammatical construction that follows a noun or noun phrase and it provides additional information about the sentence’s subject noun.

Generally, it is separated by commas (if it is non-restrictive, it provides nonessential information), unless the appositive provides important information about the noun (this type of appositive is called a restrictive appositive).

For example:

1. My friend Ben Sloan plays football.

In this case, the appositive would be Ben Sloan. We won’t separate it with commas, as we are restricting our statement to the one friend named Ben Sloan. His name is important information as it determines him as one of our friends.

2. Ben Sloan, my friend, plays football.

In this case, the appositive is my friend. We will separate this appositive with commas, because the fact that Ben is our friend is not necessary to identify him.

i'm not good at running