An interjection is a word that is interjected into a sentence. The interjection is usually an exclamatory word situated at the very beginning of a sentence, set off from the rest of the sentence with a comma.
Here are some common interjections: yikes, oh, wow, oops, no, yes
We use a comma after an introductory interjection, like this:
Yikes, it’s hot today!
No, I didn’t read your email.
Wow, that’s a cool new car!
Oh, I didn’t see you there.
An interjection usually begins a sentence and shows emotion. Use a comma after an interjection.
▶Now you try it. Add a comma to this sentence. Oops I didn’t mean to bump you. That was easy, wasn’t it?