Parts of Speech: Interjections
An interjection is a word or short phrase that expresses a sudden feeling, reaction, or command, like wow, ouch, or oops. Unlike every other part of speech, an interjection stands apart from the grammar of the sentence around it. This guide covers the different types, where they go in a sentence, and how to punctuate them correctly.
What Is an Interjection?
An interjection expresses emotion, reaction, or a sudden thought, and it's grammatically independent, meaning you can remove it and the rest of the sentence still makes complete sense.
Interjections can be a single word or a short phrase, and they can stand alone or sit inside a larger sentence.
Primary vs. Secondary Interjections
Interjections split into two categories based on where the word comes from.
Exist only as interjections. They have no other grammatical role and are often just sounds rather than dictionary words.
Ordinary words from other parts of speech, borrowed to express a sudden reaction.
Interjections by Function
Beyond their origin, interjections are also grouped by what they're expressing.
| Function | Purpose | Examples |
|---|---|---|
| Volitive | Gives a command or request | shh, psst, ahem |
| Emotive | Expresses an emotion or reaction | ew, yay, ouch, wow |
| Cognitive | Expresses a thought or hesitation | um, hmm, eureka |
| Greetings & Partings | Acknowledges someone or ends a conversation | hey, hello, bye |
Where Do Interjections Go in a Sentence?
Interjections are flexible. They can appear before a sentence, after it, or on their own entirely.
- "Yikes! There's a snake in the garage." (before)
- "That bird is huge. Wow." (after)
- "Oops." (standing alone)
When an interjection sits inside a sentence, treat it like a parenthetical element and set it off with commas or parentheses.
"The project was delayed because of a few (ahem) miscalculations."
Punctuating Interjections
The punctuation you choose signals how intense the emotion is:
- Exclamation mark: for strong emotion or urgency. "Yikes! Watch out!"
- Comma: for mild emotion, especially mid-sentence. "Well, that's unexpected."
- Period: for a low-key or resigned tone. "Oh. I didn't realize that."
- Question mark: when the interjection expresses confusion or asks something. "Hmm?"
Formal vs. Informal Writing
Interjections are common in speech, dialogue, and casual writing, but most style guides recommend avoiding them in formal or academic writing, where they can make a topic seem less serious.
A few, like well and indeed, are mild enough to pass in formal contexts, but words like wow or ugh should stay out of a research paper or business report.
How to Identify an Interjection
If you're unsure whether a word is an interjection, check these signals:
- Can you remove it without breaking the sentence? If the rest still makes grammatical sense, it's likely an interjection.
- Does it express emotion, a reaction, or a command, rather than describing anything? That's its core job.
- Is it grammatically disconnected from the rest of the sentence? Interjections don't act as the subject, verb, or object.
- Is it set off by punctuation? A comma, exclamation mark, or parentheses usually signal an interjection nearby.
Is ___ an Interjection? Quick Answers
Several common words function as an interjection in one context and something else entirely in another.
| Word | Answer |
|---|---|
| well | An interjection when it signals hesitation or transition ("Well, I guess so"), but an adverb ("sings well") or adjective ("I am well") elsewhere. |
| oh | Almost always an interjection, expressing surprise, realization, or disappointment ("Oh, I forgot"). |
| indeed | An interjection or adverb of emphasis, one of the few considered acceptable in formal writing ("It was, indeed, a difficult year"). |
| hello | An interjection as a greeting ("Hello!"), but a noun when it refers to the greeting itself ("She gave a quick hello"). |
| no | An interjection when answering or reacting ("No, thank you"), but a determiner when it modifies a noun ("no reason to worry"). |
How Learna AI Teaches Interjections?
Interjections are small, but using the right one with the right tone is part of sounding natural rather than textbook-formal in conversation. Learna AI picks up on these nuances as you speak, suggesting more natural reactions and explaining when an interjection fits the tone of the conversation. Learners practicing with Learna report an 86% increase in conversational naturalness, since real feedback on tone and reaction words is hard to get from a textbook alone.
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Frequently Asked Questions
What is an interjection?
An interjection is a word or short phrase that expresses a sudden feeling, reaction, or command, and stands grammatically apart from the rest of the sentence.
What are examples of interjections?
Common examples include wow, ouch, oops, hey, hmm, and ugh.
What are the different types of interjections?
Interjections are grouped by origin (primary or secondary) and by function (volitive, emotive, cognitive, or greetings and partings). Different sources combine these differently, which is why the total count varies.
Is "hello" an interjection?
Yes, when it's used as a greeting. It functions as a noun in a sentence like "she gave a quick hello."
Do interjections need an exclamation mark?
Not always. Strong emotion typically uses an exclamation mark, but mild emotion can use a comma, and hesitation or confusion can use a period or question mark.
Are interjections appropriate in formal writing?
Generally no. Most style guides recommend avoiding interjections in formal or academic writing, since they can undercut a serious tone. A few mild ones, like indeed, are usually acceptable.
What is the difference between a primary and secondary interjection?
A primary interjection, like ugh or psst, has no other grammatical role. A secondary interjection is a word borrowed from another part of speech, like shoot or awesome.
Can you remove an interjection from a sentence?
Yes. Interjections are grammatically independent, so removing one doesn't affect the grammatical completeness of the sentence.
What is another word for interjection?
Interjections are sometimes called exclamations, though "exclamation" more specifically refers to the punctuation mark and sentence type associated with strong interjections.
How do you punctuate an interjection in the middle of a sentence?
Set it off with commas or parentheses, just like any other parenthetical element, so it reads as separate from the main clause.
Can Learna help me sound more natural with reactions and interjections?
Yes. Learna picks up on tone and suggests more natural interjections in context, so your reactions sound less textbook and more real.
Does Learna tell me when an interjection is too informal for the situation?
Yes. Learna gives feedback on tone, letting you know when a casual interjection fits and when a more formal phrasing works better.