Coordinating & Correlative Conjunctions

Picture the start of a story you've written for homework:

The dragon woke up. He was hungry. He flew out of the cave. He wanted pizza.

Your ideas are fine — but read it back and it sounds a bit clunky. Stop, start, stop again. Now watch what happens with a few small words:

The dragon woke up and flew out of the cave, for he was hungry and wanted pizza.

Same ideas, but suddenly the sentence flows. The difference is nothing more than a handful of joining words — and, but, or and the tidy pairs like either…or. Nobody's born knowing this. You use these words perfectly well by ear — right up until a teacher asks you to explain one, or writes "not parallel" in the margin.

FANBOYS

A conjunction is a joining word. The joiners you meet first are the coordinating conjunctions, and there's a classic memory trick: FANBOYS — For, And, Nor, But, Or, Yet, So.

The word coordinating is a clue. These seven join things that are equal — two things of the same rank, sitting side by side. Neither one is the boss of the other.

They can join two single words (I packed a pen and a pencil), two phrases (We looked under the bed and behind the sofa), or — the powerful one — two complete sentences:

I finished my homework, and I went out to play.

Notice the comma before and. When you join two complete sentences with a FANBOYS word, pop a comma in front of the conjunction. When you're only joining two words or short phrases (salt and pepper), you don't need one.

Two of the FANBOYS feel old-fashioned. For here means "because" (She smiled, for she had won), and nor is the "neither" version of or. Day to day, you'll lean on and, but, or, so and yet.

Each one carries a slightly different meaning: and adds, but contrasts, or offers a choice, so shows a result, yet is a thoughtful but.

Watch out: "I revised for hours, I still failed the test." That comma isn't strong enough on its own to hold two complete sentences together. You need a joining word: "I revised for hours, but I still failed the test." (This mistake has a name — a comma splice.)

Correlative pairs and parallel structure

The other family is correlative conjunctions — pairs that work as a team. One word introduces the first item, the other introduces the second:

You can either stay late or finish it tomorrow. Neither Maya nor Leo brought a calculator. She is both kind and sharp. He not only scored the goal but also set up the next one.

Their big rule: whatever type of word or phrase follows the first half, put the same type after the second half. That matching idea is called parallel structure. Watch it break, then fix it:

✘ We will either go to the park or at home. ✔ We will either go to the park or stay at home. (two verb phrases)

✘ She is both clever and works hard. ✔ She is both clever and hardworking. (two adjectives)

A quick trick: place the first word of the pair just before the part that differs. If the subject is shared, keep it outside the pair (She is both clever and kind).

The comma trap: compound predicate vs two sentences

Here's where people slip most. A compound predicate means one subject doing two actions:

She opened her laptop and started typing.

That's one person doing two things — so no comma before and. The second half, started typing, can't stand on its own. Compare two full sentences: She opened her laptop, and she started typing. Now the second she is there, both halves could stand alone, and the comma belongs.

The test: if you can split the sentence into two sentences that each make sense on their own, use a comma. If the second part has no subject, don't.

Watch out: don't pop a comma before and just because and has appeared. "I went to the shop, and bought milk" is wrong — bought milk has no subject. Correct: "I went to the shop and bought milk."

The agreement trap

This catches out even top-set students. When you join subjects with and, you almost always get a plural: Milo and Zara are here. But with or, either/or and neither/nor, the verb agrees with whichever subject is nearest to it — the proximity rule ("proximity" means "nearness"):

Neither the teachers nor the head is available. (Nearest = "the head," singular.) Neither the head nor the teachers are available. (Nearest = "the teachers," plural.)

Same idea, opposite verb, purely because of which subject you put last. Because the strictly correct version can sound clunky, good writers often reorder the subjects so the plural sits nearest the verb. That's not cheating; it's craft. For the full story on agreement, see also the article on subject–verb agreement.

Also: neither goes with nor, never with or. And because neither…nor is already negative, don't add another "not": not "I don't have neither time nor money," but "I have neither time nor money."

One more myth to bust: you've probably been told never to start a sentence with And or But. It's a school rule, not a real rule of English — brilliant writers do it all the time for a sharp shift. Just don't do it in every line, and play it a bit safe in a formal exam essay.

Quick check

1. Which needs a comma before and? (a) I bought bread and milk. (b) I bought bread, and I forgot the milk.

2. Fix the parallel error: "He is not only funny but also he is kind."

3. Choose the verb: "Neither the dogs nor the cat (is / are) allowed upstairs."

4. Which word wrongly pairs with neither — nor or or?

5. Rewrite so both halves match: "You can either take the bus or you could walk."

Where next

• What Is Grammar? — the big picture
• Subordinating Conjunctions — because, although, when and complex sentences
• Conjunctions vs Relative Pronouns — how and, but differ from who, which
• Compound Subjects & Correlatives — subject–verb agreement, the deep dive
• Foundations — Subject–verb agreement basics, including compound subjects.
• Comma splices, run-ons, and the serial comma — in the Punctuation pillar.