An interjection is a word or a group of words that expresses strong feeling. It is not a complete sentence. An interjection is usually followed by an exclamation mark.

What type of sentence is an interjection?

An interjection is a word, phrase, or sentence that expresses emotion, meaning, or feeling. These emotion words proceed punctuation marks, which are most often but not always exclamation points. For example: Rats!

How are interjections written in a sentence?

Interjections are commonly used at the beginning of the sentence. They're also associated with a punctuation mark designed to convey emotion: the exclamation point. For example: "Yikes, I didn't realize that there was a test on grammar today!"