Capital Letters, Full Stops and Commas

Punctuation is not decoration added at the end. It is the part of writing that tells the reader where to stop, what belongs together, and which words are a name, and a sentence can change meaning entirely on one comma.

English: words and sentences · topic 3 of 6Grades 3 to 5Grammar8 min read7 practice questions

Why marks matter

Punctuation carries meaning. It is not tidying up that you do once the writing is finished.

Children are usually taught the marks as rules to remember, and remembering a rule you do not believe in is hard work that falls apart under pressure. So start with the demonstration instead, because once a child has seen one comma change who is being eaten, the rules stop feeling like somebody else's fussiness.

1Letuseatgrandma.Without the comma this sentence is about eating grandma.2Letuseat,grandma.With it, you are talking TO grandma. One mark, a different world.
Read both lines. Same four words, same order, one extra mark. The comma is what turns eating a grandmother into speaking to one.

That example is a joke, and the reason it works is that it is not really an exaggeration. A missing comma in an instruction, a price, or a message to a teacher does the same thing more quietly, and the reader has no way of knowing they have read it wrong.

Capital letters

Capitals do two jobs, and children mix them up because both are taught in the same lesson.

One: a capital opens every sentence. That one is about position, so it has nothing to do with what the word means.

Two: a capital marks a name. People, places, days, months, countries, languages, titles of things. That one is about the word itself, so it applies wherever the word lands in the sentence.

Days and months catch almost everybody. Monday and July take capitals. Summer, morning and weekend do not. No child has ever worked that out for themselves, because there is nothing there to work out: English simply decided which words count as names, and the honest thing is to say so rather than invent a reason.

Full stops

A full stop is a decision, not a punctuation mark you sprinkle at the end of a line. It says: this thought is complete, you may stop and take the next one on its own.

1onfridayweboughtapplespearsandplumsNo marks at all. It runs on and the reader has to guess.2OnFridayweboughtapplespearsandplums.A capital opens it, Friday takes one because it is a name, and a full stop closes it.3OnFridayweboughtapples,pears,andplums.Commas separate the things in the list.4OnFriday,weboughtapples,pears,andplums.A comma after the opening phrase, so Friday is not read as part of the list.
Watch one mark arrive at a time. The words never change. Everything that changes is what the reader is being told about how to read them.

Which is why the previous topic matters here. If you are not sure whether something is a complete sentence, you cannot know where the full stop goes, and a child who is guessing at full stops is usually not confused about punctuation at all. They are unsure where their sentences end.

The comma's three jobs

A comma separates. That is the whole idea, and the three jobs are three things worth separating.

Between things in a list. We bought apples, pears and plums.

After an opening phrase. On Friday, we went swimming.

Around a name you are speaking to. Come here, Sam. Or: Sam, come here.

What a comma cannot do is join two sentences. It was raining, we stayed inside. Both halves stand up on their own, and a comma is not strong enough to hold two of those together. Use a full stop, or add a joining word: It was raining, so we stayed inside. This one has a name, the comma splice, and it is the most common punctuation error in the language.

Worked examples

Punctuate this: my brother sam plays cricket hockey and chess

1mybrothersamplayscrickethockeyandchessRead it and find where the sentence ends.2MybrotherSamplayscrickethockeyandchess.Capital on my, a capital on Sam because it is a name, full stop at the end.3MybrotherSamplayscricket,hockey,andchess.Three things are listed, so commas go between them.
Follow the three steps. The words stay where they are. Only the marks arrive.
  1. Read it through and find where the thought ends. It ends at chess.
  2. Capital on My because it opens the sentence, capital on Sam because it is a name, full stop after chess.
  3. Three things are being listed, so commas go between them, with and before the last one.

My brother Sam plays cricket, hockey and chess.

What is wrong with: On monday we visited paris, it was freezing.

  1. Monday is the name of a day, so it takes a capital.
  2. Paris is the name of a city, so it does too.
  3. Now the comma. It was freezing is a complete sentence, and so is the half before it.
  4. A comma cannot hold two sentences together, so it becomes a full stop.

On Monday we visited Paris. It was freezing.

Where does the comma go: after lunch we walked to the park

  1. There is no list here, so that job is out.
  2. Nobody is being spoken to, so that job is out too.
  3. After lunch is an opening phrase, which is the third job.
  4. The comma goes after the phrase, and the sentence opens with a capital.

After lunch, we walked to the park.

Common mistakes

Putting commas where you breathe

Children are often told a comma is a short pause, and then they place one wherever they would take a breath reading aloud. It is a reasonable thing to conclude from what they were told, and it produces commas in the middle of perfectly ordinary phrases. A comma separates things, so ask what two things it is separating. If you cannot name them, it does not belong.

Capitals on important words

My Dad took me to the Football Match. Nothing there is a name. Importance is not what a capital marks, and a child who thinks it is will capitalise whatever they were most excited about, which is why the pattern shows up most in their best writing.

One full stop at the end of a paragraph

Some children write four sentences and punctuate the last one. The writing is not the problem, and neither is laziness. They have not been shown that each finished thought needs closing, so read their paragraph back to them without stopping and let them hear what it does to a listener.

Practice questions

Seven questions. One attempt each, and the explanation appears once the answer is in.

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What to learn next

For parents. Take one paragraph from anything at home, a recipe, a letter, a page of a story, and read it out loud exactly as it is punctuated, stopping fully at every full stop and pausing at every comma. Then read it again ignoring all of them. The second reading is what a reader gets when the marks are missing, and hearing it once does more than a page of rules.

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