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Sentences Start Big and End With a Dot · Sentences · CCSS.ELA-LITERACY.L.K.2.A · Capital Letters

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Sentences Start Big and End With a Dot

with Quill

Quill the friendly pen-feather perches on a sunny wooden desk in a cozy classroom, carefully pressing a giant capital letter at the start of a sentence strip and placing a bold period dot at the end with a satisfied tap.

Identify the capital letter at the beginning of a sentence.
Place a period at the end of a telling sentence.
Distinguish between sentences that follow both rules and those that do not.
Correct a sentence that is missing a capital letter or a period.

Key terms

capital letter: A big letter used at the very start of a sentence.
period: A small dot that goes at the end of a telling sentence.
telling sentence: A sentence that shares information instead of asking a question.
lowercase letter: A small letter, the kind used inside words but not to begin a sentence.

The Two Sentence Rules

Telling sentences follow two simple rules that work as a team. Rule one says the first letter must be a capital, like a tall doorway that shows where the sentence begins. Rule two says the last mark must be a period, a small dot that shows the idea is finished. When a sentence follows both rules, your eyes know exactly where it starts and where it stops.

Checking a Sentence Both Ways

To check a sentence, look at two places. First glance at the very first letter: is it big and tall like a capital? Then glance at the very end: is there a period dot after the last word? A correct telling sentence passes both checks. If it fails one check, it still needs a fix, even if the other part looks perfectly fine on its own.

Fixing a Broken Rule

When a sentence breaks a rule, you only need a small fix. If it starts with a lowercase letter, change that first letter to a capital. If it has no period, add a dot after the last word. Be careful not to stop after fixing just one problem; check the other rule too, because a sentence must follow both rules at the same time to be correct.

Worked examples

Fix the sentence "my dog barks"

Check the first letter: the m is lowercase, so it breaks rule one.
Change the m to a capital M so the sentence starts big.
Check the end: there is no period, so add a dot after barks.

Answer: My dog barks.

Is "The fish swims" written correctly?

Check the first letter: T is a capital, so rule one passes.
Check the end: there is no period dot, so rule two fails.
Add a period after swims to finish the sentence.

Answer: The fish swims.

Hi there! I am Quill, and I LOVE sentences! A sentence is a group of words that tells us one complete idea. Telling sentences — the kind that share information — follow two important rules. Rule 1: A telling sentence always STARTS with a big letter. We call that a capital letter. It is like the sentence is saying, "Hello! I am starting right here!" Rule 2: A telling sentence always ENDS with a dot called a period. The period tells our eyes, "Stop here — this idea is done!" Look at this sentence: "The cat sits." See the big T at the start? That is the capital letter. See the dot at the very end? That is the period. If a sentence is missing the capital letter or the period, it feels unfinished — like a sandwich with no bread! If you are not sure whether a sentence is correct, look back at the example above — find the big T and the dot, then check the sentence strip the same way.

Activity

Tap each sentence strip and sort it into the correct bin — does it follow both rules: capital letter at the start AND a period at the end?

Practice

Rewrite the words "the bird sings" so the sentence follows both rules.

Look at "She jumps." and tell which rule the capital letter follows.

Common mistakes to avoid

A period alone makes a sentence correct.A period is only one rule; the sentence must also begin with a capital letter to be correct.
Any sentence can start with a small letter.Every telling sentence must begin with a capital letter, no matter what word comes first.

Check your understanding

Which sentence is written the RIGHT way — with a capital letter at the start and a period at the end?

A friend wrote: "my dog barks." What needs to be fixed?

A friend wrote: "The fish swims" What needs to be fixed?

Recap

A correct telling sentence follows two rules at once: it starts with a capital letter and ends with a period dot. Always check the first letter and the last mark before you decide a sentence is finished.

Reflect

Which rule do you think people forget more often, the capital or the period?