Coordinating Conjunctions

Coordinating conjunctions are the simplest and most common way to join two grammatically equal elements — two words, two phrases, or two independent clauses. English has exactly seven of them, and they are easy to remember with the acronym FANBOYS: for, and, nor, but, or, yet, and so. Each one signals a different logical relationship between the elements it connects.

And is for addition: I packed a sandwich and an apple. But signals contrast: She studied hard but still felt nervous. Or presents alternatives: Would you like tea or coffee? So expresses a result: The train was delayed, so I arrived late. Yet is similar to but but carries an implication of surprise: He had little experience, yet he got the job. For is formal and literary, giving a reason much like because: She stayed behind, for she had unfinished work. Nor adds a second negative element and triggers inversion in the following clause: He didn't call, nor did he send a message.

If you compare coordinating with subordinating conjunctions, the key difference is independence: a clause joined by a coordinating conjunction can stand alone as a complete sentence; a clause introduced by a subordinating conjunction cannot. Coordinating conjunctions keep both ideas on equal footing, whereas subordinating conjunctions make one idea dependent on the other.

When you join two independent clauses with a FANBOYS conjunction, place a comma before the conjunction: I wanted to go out, but it was raining. The comma is optional if the clauses are very short: I ran and she walked. Do not use a comma when joining only words or phrases: I bought apples and oranges (no comma). In lists of three or more items, the Oxford comma before the final and is a stylistic choice — we invited Ali, Sarah, and Tariq — neither required nor incorrect.

A common myth says you cannot begin a sentence with a coordinating conjunction. In fact, it is perfectly acceptable in modern English: But that was only the beginning. And she never looked back. Just use it deliberately for emphasis, not as a crutch.