Continuing Commas, Part 2: Comma Categories

When I started editing for our first anthology I checked everything. But my investigation of commas soon ran away with itself; there was much more to commas than I’d realised. My notes stretched to fill five blog posts. And that’s just the basics.

punctuation marks

Our writing group has more members since then, so I’m repeating those posts; apologies to those of my readers who could probably teach me a thing or two about commas. (Please feel free to chip in down below.)

I’ll try to avoid mentioning subjunctives, subordinates, or even relatives.

The LURE of Commas

The web page of the University of Sussex library offers a helpful guide to commas at This classifies them into four types: listing, joining, gapping and bracketing.

I’ve renamed this quartet of commas as Listing, Uniting, Replacing and Enclosing, because I can remember them more easily as an acronym.

comma OK

The Listing comma can always be replaced by the word and or the word or.

I like pasta, rice and chips.

I like pasta and rice and chips.


Would you like pasta, rice or chips?

Would you like pasta or rice or chips?

comma OK

The Uniting comma joins two sentences as long as it is followed by a connecting word, such as and, or, but, yet or while.

I am tall, but my sister is even taller.

I am tall, and my sister is even taller.

I am tall, yet my sister is short.

You must eat, or you won’t grow tall.

Although you’ll remember from my previous blog post that short sentences like these with a clear meaning can manage without the comma.

I am tall but my sister is taller.

You must eat or you won’t grow tall.

The bell rang and the classroom emptied.

NOTE, you must have that joining word between those two halves, not just a comma as in the sentence below.

I am tall, my sister is taller.

This is known as a comma splice and is frowned upon.

More about the comma splice in a later post, but for now remember that, without a word to join them, two complete sentences rate a full stop and a capital letter.

I am tall. My sister is taller.

comma OK

The Replacing comma shows you have left out some words to avoid repetition.

I am the tallest of us and my sister, the shortest.

On Monday the rain fell and on Tuesday, the snow.

comma OK

Enclosing commas come in pairs and act like brackets. (Okay – Bracketing is a better description. . . but would you remember LURB?)

If you remove the phrase between the enclosing commas, the sentence should still make sense.

My brother, who wears a hoodie, never takes an umbrella.

Be alert for a ‘hidden’ enclosing comma that has been overruled by the start or end of the sentence.

The weather has been unpredictable, to put it mildly.

comma OK

Now try LURE out on this sentence.

The torrential rain this morning, was heavier than yesterday.

L – This comma can’t be replaced by and or or; so it isn’t a Listing comma;

U – The comma isn’t followed by a connecting word, so can’t be a Uniting comma;

R – No words have been left out, so this isn’t a Replacing comma;

E – The comma isn’t one of a pair of Enclosing commas. The words before the comma can’t be safely removed, nor the words after it; the result, in either case, would not be a sentence.

Since it doesn’t fit any of these situations, the comma shouldn’t be there.

The torrential rain this morning was heavier than yesterday.

commas OK

You can find more details, further examples, and a handy summary sheet, at



Next time… 

Words like who, which, and whose, bring comma complications of their own. I’m saving those for next time.

Does anyone have a favourite tip for uncluttering commas?

Please share it with us.

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12 thoughts on “Continuing Commas, Part 2: Comma Categories

    1. I wasn’t taught that, but I avoid any word repeats unless it’s to make a point. If your ‘and’s are close together it doesn’t read well and if they’re further apart, your sentence is too long.


    1. Of all the punctuation I’ve looked into, commas seem to have the most ‘rules’. You can decide not to use things like colons and semi-colons, but you can’t ignore commas.


  1. I’ve just been going over my original post on apostrophes (which WordPress didn’t want to display for some reason, so I’ve deleted the original.) It will be coming up after I run out of comma posts. 🙂

    Liked by 1 person

  2. I found it very difficult to teach commas to my college students once I began to get ones who had no idea about complete sentences, phrases or clauses. It felt pretty futile. They always thought a phrase qualified as a sentence. “But it sounds good!”

    Liked by 2 people

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