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Capital Letters and Periods

A 30-minute Kindergarten lesson on the two marks that bracket a sentence, taught by finding sentences that are missing them.

Capital Letters and Periods is a free 30-minute Kindergarten English lesson plan for Common Core standard L.K.2 — start sentences with a capital, end them with a period, and spell simple words. It is timed across 5 sections, gives the exact wording to use where the wording carries the meaning, names 3 misconceptions with the teaching move that addresses each, and ends with an exit ticket and a printable worksheet with its answer key.

Grade:
Kindergarten
Length:
30 minutes
Standard:
L.K.2

Kindergarten · Language

L.K.2

Demonstrate command of the conventions of standard English capitalization, punctuation, and spelling when writing.

Objective

Students will be able to start a sentence with a capital letter, end it with a period, and write the word I as a capital.

Students are successful when they can

  • Writes "The cat sat." with a capital T and a period after "sat."
  • Writes the word I as a capital wherever it sits in the sentence.
  • Fixes "my dog is big" to "My dog is big." and says what was missing.

What you need

  • Five sentence strips with the capitals and periods missing (see Teach)
  • A red pen for the teacher's fixes
  • The printable practice sheet linked at the end of this plan

The lesson

Warm-up — what is missing?

4 min
  1. Write on the board: "the sun is hot." Read it aloud, pointing under each word.
  2. Ask: "Something is missing at the start and something is missing at the end. What?" Take answers.
  3. Fish for "a big letter" and "a dot." Accept those words for now; you will name them in the Teach.

Teach — the two ends of a sentence

9 min
  1. Fix "the sun is hot" in red. Overwrite the t with a capital T: "A sentence starts with a capital letter." Add the period: "A sentence ends with a period."
  2. Write "we can run." Ask the class to tell you what to do. Fix it in red as they say it: "We can run."
  3. Write "a cat sat on a mat." Read it slowly with no pause at the end, then carry on into "a dog ran to the cat" without stopping. Ask: "Where did my sentence stop?" Add the period after "mat" and a capital A on the second one.
  4. Write "i can see a bug." This has a stop already and no capital. Ask what is wrong. Many will say "nothing." Point at the i: "This little word is me. When I write about me, I always use a big I." Fix it.
  5. Write "Mom and i went out" and fix both the i and the period, saying: "I is always a capital — at the start, in the middle, anywhere."
“The capital letter says start. The period says stop. And the word I is always a capital, wherever it is.”

Guided practice — fix six

9 min
  1. Hand pairs strips: "my hat is red," "the dog can dig," "i like jam," "we sat in the sun," "look at me," "can i go." Read each aloud for them first.
  2. Pairs fix each strip with a pencil: one child says what is missing, the other writes the mark.
  3. Circulate. Ask a child to point to where the sentence ends and say "stop" with their voice there.
  4. Bring back "can i go" and note it is a question: say it with the voice going up and add a question mark. Do not teach it as a rule today; just let them hear it.
“Read it with your finger. Where does your voice stop? Put the period there.”

Independent practice

6 min
  1. Read every sentence on the printable aloud before children begin.
  2. Children copy each sentence on the line underneath with the capital and the period added.
  3. Check the first sentence of each child within the first minute; one early correction saves six later ones.

Close

2 min
  1. Write "i see a fox" on the board.
  2. Ask: "How many fixes?" Fish for two (the capital I and the period). Make them, reading the sentence aloud.

What goes wrong, and why

Each of these is a reasoning error rather than carelessness. The fix addresses the reasoning.

Writes "my dog and i ran." with a lower-case i in the middle.

Why: Every other one-letter word they write, like "a," is lower case, and the rule for I is arbitrary; nothing about its sound says capital.

Fix: Call it the one special word: "I means me, and I is always big." Put a big I on the word wall with that label and check for it every time you read a child's writing.

Writes "The Dog is Big." with capitals on important-looking words.

Why: They have learned that capitals mark something special and apply it to the words that matter most to them.

Fix: Teach the capital by position, not importance: first letter of the sentence, names, and I. Ask "Is Dog at the start? Is it a name?" If neither, it is small.

Puts a period at the end of every line instead of every sentence.

Why: In their own writing a line and a sentence usually end together, so the two have become the same idea.

Fix: Write a long sentence that wraps onto a second line. Read it aloud without pausing at the wrap, and put the period only where your voice stops.

If they are not there yet

  • Fix one thing at a time: a week of capitals only, then a week of periods only.
  • Give three-word sentences that fit on one line: "i am six," "we can hop."
  • Give a card showing a capital T beside a small t, and a big dot, to copy from.

If they finish early

  • Add a question: "can you hop" becomes "Can you hop?" Ask how the voice tells you which mark to use.
  • Fix three sentences run together on one strip: "the cat sat the dog ran we went home."
  • Hunt a real picture book page for capitals and say why each one is there: start, name or I.

Exit ticket

Write this correctly: "i saw a fox"

What to look for: "I saw a fox." — capital I and a period. Missing the period: retell "the voice stops here." Lower-case i: re-teach the special word. A capital on Fox as well: the child thinks capitals mark important words.

Printable practice for L.K.2

Free to print and copy, answer key included. Each sheet can generate a fresh set of problems for a retake.

Questions about Capital Letters and Periods

How long does the Capital Letters and Periods lesson take?

30 minutes, split across 5 timed sections: warm-up 4 min, teach 9 min, guided practice 9 min, independent practice 6 min, close 2 min. The minutes are stated per section and add up to the stated length, so the plan can be cut or extended at a section boundary rather than abandoned halfway.

Which standard does Capital Letters and Periods teach?

CCSS.ELA-LITERACY.L.K.2 — L.K.2, Language for Kindergarten: “Demonstrate command of the conventions of standard English capitalization, punctuation, and spelling when writing.” In plain terms, start sentences with a capital, end them with a period, and spell simple words.

What do I need to teach this lesson?

Five sentence strips with the capitals and periods missing (see Teach), a red pen for the teacher's fixes and the printable practice sheet linked at the end of this plan. Everything listed is either ordinary classroom equipment or a free printable from this site — there is nothing to buy and nothing to prepare beyond photocopying.

What mistakes should I expect in this lesson?

Three, each a reasoning error rather than carelessness: writes "my dog and i ran." with a lower-case i in the middle; writes "The Dog is Big." with capitals on important-looking words and puts a period at the end of every line instead of every sentence. The plan gives the thinking behind each one and the teaching move that addresses the thinking rather than the symptom.

How do I know whether the lesson worked?

The exit ticket asks: “Write this correctly: "i saw a fox".” "I saw a fox." — capital I and a period. Missing the period: retell "the voice stops here." Lower-case i: re-teach the special word. A capital on Fox as well: the child thinks capitals mark important words. That tells you whether the class needs a reteach or a thirty-second conversation before you plan tomorrow.

Is there a worksheet to go with Capital Letters and Periods?

Yes — 1 printable L.K.2 worksheet, linked at the end of the plan and free like the rest of the site. Each one comes with an answer key and 25 versions, so the practice after the lesson can be a different paper on every desk.

Is Capital Letters and Periods free to use?

Yes. The plan, its printables and their answer keys are free to read, print and photocopy for your own class, with no account and no email capture. It was last reviewed on October 8, 2026. Please do not resell it or republish it as your own.

Last reviewed 2026-10-08. Aligned to L.K.2 of the Common Core State Standards for English Language Arts.