Interjections add excitement to writing. They provide expression
and emotion to a sentence. Interjections are words that carry strong feelings. For
example:
Oh no! The zoo animals got
loose.
Aha! I’ve got it!
In the above examples, “Oh no” and “Aha” are interjections.
If you want your interjection to be full of emotion, place
an exclamation point after it, but if you don't want your interjection to be
too strong, simply use commas to separate it. Here are some commonly used
interjections:
Wow!
Oh no!
Darn!
Aha!
Bravo!
Oh,
Interjections may provide excitement and emotion in casual
writing, but they are not used in formal writing.