What is a apossitive sentence?

There's no such thing as an "apossitive sentence." You're likely thinking of an appositive phrase.

Here's what an appositive phrase is:

An appositive phrase is a noun phrase that renames or identifies another noun phrase. It's placed directly after the noun it's describing, and it's usually set off by commas.

Example:

* My friend, a talented musician, played the guitar at the party.

In this example, "a talented musician" is the appositive phrase. It renames the noun "friend."

Here are some key points about appositive phrases:

* They are always noun phrases.

* They add extra information about the noun they modify.

* They are usually set off by commas.

* They can be short or long.

Here are some other examples of appositive phrases:

* My favorite author, J.K. Rowling, wrote the Harry Potter series.

* The new car, a sleek black sedan, was a dream come true.

* We visited the Grand Canyon, a natural wonder.

Let me know if you'd like more examples or information!