Interjections are words like "hey", "ouch", and "wow" that are often standalone and don't have a grammatical relation to other words in a sentence. Interjections are followed by commas if used in a normal tone or exclamation points if emphasis is needed, and examples provided demonstrate their use in different sentences and with different punctuation.

2. Often stand alone
If it is a part of a
sentence, it doesn’t have
a grammatical relation to
other words in the
sentence.

3. Interjections are followed by
commas or exclamation points.
Use a comma if the tone is
normal.
Use an exclamation point if
great emphasis is to be placed
on the interjection.

4. Hey, what’s going on?
Well, I don’t know what to
say.
Ouch! Did you step on my
toe?
Wow! That test was so
hard!