Are you confused about when to add commas before coordinating conjunctions linking independent clauses? This post offers guidance and a few examples to show you the way.
Rules, convention and meaning
Some writers and editors love a rule. I’m not so keen on the language of ‘rules’ because it sets up a binary mindset that’s focused on ‘wrong’ versus ‘right’ rather than clarity of meaning. Instead, I prefer to think in terms of convention.
Grammatical conventions are useful and purposeful. They provide us with a common frame of reference that helps us communicate clearly through the written word. We can start by at least acknowledging the following:
Balancing convention and meaning
Writing and editing fiction requires deciding when to break with convention. But how do we work out what works and what doesn’t? Here’s how I frame the balancing act:
So how does that apply to commas, coordinating conjunctions and independent clauses?
What are coordinating conjunctions?
Coordinating conjunctions are words that join other words or groups of words of equal weight. You might see them referred to in short as FANBOYS:
What are independent clauses?
Independent clauses are groups of words that can stand as a sentence on their own and still make sense. They include a subject and a predicate.
Subjects are people/things that are doing something or being something – the noun (the thing) and the adjectival information describing that noun. The four examples given below are all subjects.
Predicates are what they’re doing – the verb (the doing word) and the thing the verb’s acting on. The four examples below are all predicates.
Joining subjects and predicates gives us independent clauses. Here are two simple examples (subject in bold; predicate underlined).
The comma convention
If two or more independent clauses in a sentence are joined by a coordinating conjunction, it’s conventional to place a comma before that conjunction.
EXAMPLE AND EVALUATION #1
In the following example, the independent clauses are in bold.
The dog is pale yellow, and it's licking its paws.
The independent clauses could stand on their own as complete sentences and be understood perfectly well. Let’s revisit our balancing act and assess the impact of the comma.
The degree to which the comma serves meaning here is, I think, debatable. This is what it looks like without the comma:
The dog is pale yellow and it's licking its paws.
There’s no ambiguity there, and so one could argue that insisting on a comma would be grammatical pedantry. An editor would struggle to justify adding a comma for any other reason than ‘that’s the rule’ or 'I think it looks better' because the meaning is perfectly clear.
Could someone argue that the comma enforces the equal weighting of the independent clauses lying either side of the coordinating conjunction?
Yes in that it acts as a separator of two ideas: the dog’s colour and what it’s doing to its paws; the one isn't related to the other. And so I certainly wouldn’t remove it if it were already in place; there’s no justification for such an action.
MORE COMPLEX CONSTRUCTIONS
Many sentences in fiction are more complex. If our example looked like this, we might have a sounder justification for adding the comma:
She stops in the doorway and holds her breath. She’s found it. The dog is pale yellow and it's licking its paws and nipping at the bloodied fur around the wound.
In the revised example below, I think applying the conventional punctuation helps. The rhythm is moderated – we take a little breath when we reach the comma – and experience (through our viewpoint character’s eyes) first the colour of the dog and then what it’s doing and why.
The two ideas have a starker separation, and the punctuation convention supports that meaning.
She stops in the doorway and holds her breath. She’s found it. The dog is pale yellow, and it's licking its paws and nipping at the bloodied fur around the wound.
EXAMPLE AND EVALUATION #2
Here’s an excerpt from Robert Ludlum’s The Janson Directive (Orion, 2003, p. 355). Once more, both independent clauses are in bold.
Another dumb, inanimate slug would shatter another skull, and another life would be stricken, erased, turned into the putrid animal matter from which it had been constituted.
The independent clauses could stand on their own as complete sentences and be understood perfectly well. Again, let’s revisit our balancing act and assess the impact of the comma.
I think the comma serves meaning and is necessary. Without it, we might start to read the sentence as if the slug would shatter not just a skull but another life too. That’s not what Ludlum is saying. Instead, we’re alerted that another idea is coming into play.
A trip-up here means the reader would have to fix the grammar in their head and reread the sentence to make sense of it. That’s a momentary distraction no writer wants.
Breaking with convention in fiction
Let’s have a look at when we might ignore grammatical convention.
Below is a short scene I’ve made up. Our protagonist is a forty-year-old woman having a nightmare about a past event.
There’s a huge yellow dog snarling in the doorway, blocking the way out. Its hackles are raised and it’s grinding its teeth and it’s foaming at the mouth and it’s—
I wake, slick with sweat, the six-year-old me hovering spectre-like in my mind’s eye. It’s the third time I’ve had that dream in the past week.
There are three independent clauses (and the start of a fourth) linked by a coordinating conjunction. The ‘rule’ says there should be a comma before all those ‘and’s.
A pro fiction editor would want to think twice before they start adding in commas because of some rule or other.
Using anaphora doesn’t mean we have to ignore commas, far from it. But what would introducing them do to rhythm and mood?
I think the lack of commas helps us to feel our way under the skin of that dream-child because young children in a panic don’t introduce pauses or moderate their speech according to a style manual or a grammar guide. Instead, words fly from their mouths like tiny storms.
What we have instead is the sense of terrified disorientation being experienced by the dreamer, one that’s shown rather than told.
Commas would moderate the pace and separate the ideas contained in each independent clause; omitting them means we’re offered a stream of terrified consciousness.
Some grammarians do allow for an exception when the independent clauses are short and closely related.
In the examples that follow, the coordinating conjunctions are underlined; notice the absence of the preceding comma. Sense isn’t marred because of the missing punctuation.
It’s an eminently sensible exception – one that allows for decluttering but also avoids a separation of ideas that isn’t appropriate.
The grammatical convention of placing a comma before a coordinating conjunction linking independent clauses is helpful and useful. However, sometimes we can omit those commas:
Style and grammar resources offer guidance, and we should use them, but only in so far as they serve the reader and the story, not because we are rule enforcers. That’s nothing more than a road to literary butchery.
More resources to help you line edit with confidence
Louise Harnby is a line editor, copyeditor and proofreader who specializes in working with crime, mystery, suspense and thriller writers.
She is an Advanced Professional Member of the Chartered Institute of Editing and Proofreading (CIEP), a member of ACES, a Partner Member of The Alliance of Independent Authors (ALLi), and co-hosts The Editing Podcast.
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