Interjections are included in a sentence (usually at the start) to express a sentiment such as surprise, disgust, joy, excitement, or enthusiasm. For example: Yes, I've won.

Where do interjections go?

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!"

Can interjections go anywhere?

Interjections are generally used at the beginnings of sentences, but they may come anywhere in the sentence.