Opening subject page...
Loading your content
Discover the three small but mighty parts of speech that connect, locate, and express emotion in every sentence you write.
People have been sorting words into groups for a very long time. Thousands of years ago, thinkers in ancient Greece and India noticed that some words name things, some words show action, and some tiny words do special jobs like connecting ideas or showing feelings. Let's walk through a quick timeline of how people figured out these parts of speech.
So here's the big question this lesson answers: What exactly do conjunctions, prepositions, and interjections do in a sentence, and how can you spot them? By the end, you'll be able to identify each one and explain its job like a grammar pro.
Before we dig deeper, let's get crystal clear on what each of these three parts of speech means. Think of them as three different tools in your writing toolbox — each one does a different job.
The diagram below shows how each part of speech works inside a sentence. Look at how the conjunction connects two ideas, the preposition links a noun to the rest of the sentence, and the interjection stands on its own.
In the diagram above, notice three important things. First, the conjunction "and" sits right between the two words it connects. Second, the preposition "on" begins a phrase that tells you where the cat sat. Third, the interjection "Wow" sits at the start and is set off by a comma because it expresses a feeling — it doesn't grammatically connect to the rest of the sentence the way other words do.
There are three main kinds of conjunctions you should know. Coordinating conjunctions connect words, phrases, or sentences that are equal in importance. You can remember the seven coordinating conjunctions with the memory trick FANBOYS: For, And, Nor, But, Or, Yet, So.
Subordinating conjunctions connect a less important idea to a more important one. Words like because, although, when, if, since, and while are subordinating conjunctions. They make one part of the sentence depend on the other. For example, in "I stayed inside because it was raining," the word because shows that one idea explains the other.
Correlative conjunctions come in pairs. You've probably used both…and, either…or, neither…nor, and not only…but also. They work as a team to connect balanced ideas.
Prepositions usually tell you about location (where something is), time (when something happens), or direction (which way something moves). A preposition always starts a prepositional phrase, which ends with a noun or pronoun called the object of the preposition.
Here are some of the most common prepositions: in, on, at, to, from, by, with, about, under, over, between, through, before, after, during. In the sentence "The bird flew over the house," the preposition over tells you where the bird flew, and "over the house" is the full prepositional phrase.
Interjections are the most unusual part of speech because they don't grammatically connect to the other words in a sentence. They simply pop in to show feelings like surprise (Wow!), pain (Ouch!), happiness (Yay!), or relief (Phew!). A strong interjection is followed by an exclamation point. A mild interjection is followed by a comma.
This chart gives you a birds-eye view. Each column is one part of speech with its subtypes and examples. When you're writing, you can use this chart like a menu — pick the right conjunction, preposition, or interjection for the job you need done!
Let's look at each part of speech more closely and learn how to identify it inside a real sentence. The table below shows example sentences with the target word highlighted, its part of speech, and what job it's doing.
| Sentence | Word | Part of Speech | Job It Does |
|---|---|---|---|
| I like pizza and pasta. | and | Coordinating conjunction | Joins two nouns (pizza, pasta) |
| She studied hard, so she passed the test. | so | Coordinating conjunction | Joins two complete sentences and shows result |
| We left early because it started raining. | because | Subordinating conjunction | Joins a reason to the main idea |
| Either you come now or we leave without you. | either…or | Correlative conjunction | Joins two choices as a pair |
| The keys are on the counter. | on | Preposition | Shows where the keys are (place) |
| We'll eat dinner after the game. | after | Preposition | Shows when we'll eat (time) |
| She walked through the door. | through | Preposition | Shows the direction of movement |
| Wow! That sunset is beautiful. | Wow! | Interjection (strong) | Expresses surprise/amazement |
| Oh, I didn't see you there. | Oh, | Interjection (mild) | Expresses mild surprise |
| Ouch! That hurt! | Ouch! | Interjection (strong) | Expresses pain |
Let's take one sentence and find every conjunction, preposition, and interjection hiding inside it. Here's our sentence:
It's easy to mix up conjunctions, prepositions, and interjections when you're first learning them. This side-by-side comparison will help you keep them straight.
| Feature | Conjunction | Preposition | Interjection |
|---|---|---|---|
| Main job | Joins words, phrases, or sentences | Shows a relationship (where, when, how) | Expresses sudden emotion |
| Does it need other words? | Yes — it needs things on both sides to connect | Yes — it always needs an object noun after it | No — it can stand alone |
| Where in the sentence? | Between the things it connects | Before a noun or pronoun | Usually at the beginning (or alone) |
| Punctuation clue | Comma before it when joining two full sentences | No special punctuation | Exclamation point (!) or comma (,) |
| Example | I ran and I jumped. | I ran to the store. | Yay! I won! |
| Analogy | Glue that holds pieces together 🔗 | A GPS pin showing location 📍 | A firework — a quick burst of feeling 💥 |
You're building a strong foundation right now. In middle school and beyond, you'll use what you know about these three parts of speech to do even more interesting things with language. Here's a quick preview of what's coming.
| What You Know Now | What You'll Learn Later |
|---|---|
| Coordinating conjunctions (FANBOYS) join equal ideas | You'll learn how to use semicolons and conjunctive adverbs (like however, therefore) to connect ideas in more advanced ways |
| Prepositional phrases tell where, when, or how | You'll learn that prepositional phrases can act as adjectives (describing nouns) or adverbs (describing verbs) and you'll choose where to place them for the best effect |
| Interjections express emotion | You'll study tone and voice in writing, learning when interjections strengthen your writing and when they're better left out |
| You can identify parts of speech in a sentence | You'll diagram sentences to show exactly how every word connects — like building a map of a sentence's structure |
The best part is that everything you learn today makes those future lessons much easier. You're not just memorizing definitions — you're learning to see how sentences are built, and that's a skill you'll use for the rest of your life.
Now it's your turn! Try these five problems. Start with the easier ones and work your way up. Click "Show Answer" when you're ready to check your work.
In this lesson, you learned about three important parts of speech. Conjunctions are the connecting words — they join words, phrases, or sentences. The seven coordinating conjunctions (FANBOYS: for, and, nor, but, or, yet, so) connect equal ideas, while subordinating conjunctions like because, when, and although connect a main idea to a supporting one. Correlative conjunctions like either…or work in pairs.
Prepositions are the relationship-showing words. They sit before a noun and form a prepositional phrase that tells you where (in, on, under), when (before, after, during), or how (with, by) something happens. Interjections are emotion words — short exclamations like Wow!, Ouch!, or Hey that express sudden feelings. Strong interjections use an exclamation point, and mild ones use a comma. Remember: to identify each one, ask what job the word is doing. Is it joining? Showing a relationship to a noun? Or expressing emotion? That question will guide you every time.