Coordinating conjunctions are the essential connectors of English grammar. These seven small words—for, and, nor, but, or, yet, so—join words, phrases, and independent clauses of equal grammatical rank. Remembered by the acronym FANBOYS, these conjunctions are used constantly in both speech and writing. This guide provides a thorough exploration of each conjunction, explains punctuation rules, and helps you use them with confidence and precision.
Table of Contents
What Are Coordinating Conjunctions?
A coordinating conjunction joins grammatically equal elements: two words, two phrases, or two independent clauses. The word "coordinating" means these conjunctions connect elements of the same type and importance—unlike subordinating conjunctions, which make one clause dependent on another.
Two words: "bread and butter"
Two phrases: "in the morning or in the evening"
Two clauses: "She studied hard, so she passed the exam."
The FANBOYS Acronym
| Letter | Conjunction | Function |
|---|---|---|
| F | for | Reason/cause |
| A | and | Addition |
| N | nor | Negative addition |
| B | but | Contrast/exception |
| O | or | Alternative/choice |
| Y | yet | Contrast/surprise |
| S | so | Result/consequence |
F — For
"For" as a coordinating conjunction means "because" or "since." It introduces a reason or explanation for the preceding clause. Note: "for" as a conjunction is more formal and literary than "because."
"She brought an umbrella, for the forecast predicted rain."
"He didn't go outside, for it was far too cold."
"They were quiet, for the baby was sleeping."
"For" always introduces a reason that comes after the first clause. It cannot begin a sentence when used as a coordinating conjunction. A comma always precedes "for" when it joins two independent clauses.
A — And
"And" is the most common coordinating conjunction. It adds information, showing that both elements are true or applicable:
"She plays piano and violin."
"He studied all night, and he passed the exam."
"The house is spacious and affordable."
"We visited Paris, Rome, and Madrid."
N — Nor
"Nor" presents a second negative idea that pairs with the first negative. It often pairs with "neither" or follows a negative clause. When "nor" joins two independent clauses, the subject and auxiliary verb in the second clause are inverted:
"She doesn't eat meat, nor does she eat fish."
"He has never visited Paris, nor has he been to London."
"Neither the teacher nor the students were prepared."
"I can't sing, nor can I dance."
B — But
"But" shows contrast, exception, or unexpected information:
"She is small but strong."
"I wanted to go, but I was too tired."
"The movie received terrible reviews, but it was a box-office hit."
"He's not a professional, but he plays like one."
O — Or
"Or" presents alternatives, choices, or possibilities:
"Would you like tea or coffee?"
"We can eat at home, or we can go to a restaurant."
"Study hard, or you won't pass the exam."
"Is that a cat or a small dog?"
Y — Yet
"Yet" as a conjunction is similar to "but" but adds a sense of surprise or contradiction. It suggests something unexpected in light of the first clause:
"She is 90 years old, yet she runs every morning."
"The instructions were simple, yet many people made errors."
"He had no formal training, yet he became a world-class chef."
S — So
"So" shows a result, consequence, or effect of the first clause:
"It was raining, so we stayed inside."
"She studied hard, so she aced the exam."
"The store was closed, so we went home."
"He was hungry, so he ordered a pizza."
Punctuation Rules
Joining Two Independent Clauses: Use a Comma
When a FANBOYS conjunction joins two independent clauses, place a comma before the conjunction:
✓ "She sings, and he plays guitar."
✓ "I was tired, but I finished the project."
Joining Two Words or Phrases: No Comma
When a FANBOYS conjunction joins two words, phrases, or dependent clauses, do not use a comma:
✓ "She sings and plays guitar." (Two verbs sharing a subject — no comma)
✗ "She sings, and plays guitar." (Incorrect comma)
Serial Comma (Oxford Comma)
When listing three or more items, "and" or "or" precedes the final item. The comma before this conjunction (the Oxford comma) is recommended for clarity:
"I bought apples, oranges, and bananas." (Oxford comma — recommended)
"I bought apples, oranges and bananas." (No Oxford comma — acceptable)
Joining Words and Phrases
FANBOYS conjunctions don't just join clauses—they also join equal words and phrases:
Nouns: "cats and dogs"
Adjectives: "tall but thin"
Verbs: "run or walk"
Prepositional phrases: "in the morning or at night"
Infinitive phrases: "to sing and to dance"
When joining elements with conjunctions, ensure the elements are parallel in structure. If you join a noun with a noun, a verb with a verb, a phrase with a phrase of the same type.
Starting Sentences with Conjunctions
Can you start a sentence with "and," "but," "so," or other FANBOYS conjunctions? Despite what many were taught in school, the answer is yes. There is no grammatical rule against it, and skilled writers have done so for centuries. Starting a sentence with a conjunction can add emphasis, create a conversational tone, or provide a smooth transition:
"But that was only the beginning."
"And that's exactly what happened."
"So what does this mean for the future?"
Use this technique sparingly in formal academic writing, but don't avoid it out of a false sense of rules.
Common Errors
1. Comma Splice Without a Conjunction
✗ "She was tired, she went home."
✓ "She was tired, so she went home."
2. Comma Before a Conjunction Joining Non-Clauses
✗ "He ran, and jumped." (No second subject — not two clauses)
✓ "He ran and jumped."
3. Using "But However" Together
✗ "She was tired, but however, she continued." (Redundant)
✓ "She was tired, but she continued."
✓ "She was tired; however, she continued."
4. Faulty Parallelism
✗ "She likes swimming, hiking, and to ride bikes."
✓ "She likes swimming, hiking, and riding bikes."
Practice Exercises
Choose the correct FANBOYS conjunction and add appropriate punctuation:
- "She wanted to travel ___ she saved money all year."
- "The exam was difficult ___ most students passed."
- "We can go to the movies ___ we can stay home."
- "He never complains ___ does he make excuses."
- "She was exhausted ___ she had worked a double shift."
Answers: 1. ", so" (result). 2. ", yet" (surprise/contrast). 3. ", or" (alternative). 4. ", nor" (negative addition). 5. ", for" (reason).
Key Takeaway: The seven FANBOYS conjunctions—for, and, nor, but, or, yet, so—are the only coordinating conjunctions in English. They join equal grammatical elements. Use a comma before them when joining independent clauses, but not when joining words or phrases. Mastering these seven words and their punctuation rules is fundamental to writing clear, well-structured sentences.