# When to use a semicolon

Canonical: https://duckyhelper.com/learn/grammar/semicolons/
Updated: 2026-10-01

Use a semicolon to join two complete sentences that are closely related when there is no and, but or so between them: I was tired; I went to bed early. Also use one before words like however and therefore when they start the second sentence, and between list items that already contain commas. Each side of a semicolon between clauses must be able to stand alone as a sentence.

## The three uses

| Use | Wrong | Right | Why |
| --- | --- | --- | --- |
| Join two related sentences | *The library was closed, we studied at home.* | *The library was closed; we studied at home.* | Two complete sentences cannot be joined by a comma alone. A semicolon can join them. |
| Before *however*, *therefore*, *moreover* | *It rained, however, the game went on.* | *It rained; however, the game went on.* | *However* is not a joining word like *but*. The two sentences still need a semicolon or a period. |
| Lists whose items have commas | *The tour visits Austin, Texas, Denver, Colorado, and Portland, Oregon.* | *The tour visits Austin, Texas; Denver, Colorado; and Portland, Oregon.* | Semicolons show where each item ends when the items contain commas. |

## When not to use one

| Mistake | Example | Fix |
| --- | --- | --- |
| Before a part that is not a full sentence | *Because it was late; we went home.* | *Because it was late, we went home.* |
| To introduce a list | *Bring three things; a pencil, a ruler, and a calculator.* | Use a [colon](https://duckyhelper.com/learn/grammar/colons/): *Bring three things: a pencil, a ruler, and a calculator.* |
| Between two unrelated sentences | *My dog is brown; the test is on Friday.* | Use two separate sentences. |

> **Tip: The period test**
>
> Between clauses, a semicolon works like a soft period. If you could not put a period there, you cannot put a semicolon there.

## Worked examples

**Example 1: fix a comma splice**

Problem: *The movie ended, everyone clapped.*

1. Check each side: *The movie ended* and *everyone clapped* are both complete sentences.
2. A comma alone cannot join them. Replace it with a semicolon, because the ideas are closely related.

Answer: *The movie ended; everyone clapped.*

**Example 2: however in the middle**

Problem: *The forecast called for rain however the game went on as planned.*

1. Find the two sentences: *The forecast called for rain* and *the game went on as planned*.
2. *However* starts the second sentence, so the semicolon goes before it and a comma goes after it.

Answer: *The forecast called for rain; however, the game went on as planned.*

**Example 3: a list with commas inside**

Problem: *We met Ana, the captain, Leo, the goalie, and Sam, the coach.*

1. As written, it could be six people. Each item is really a name plus a role.
2. Keep the comma inside each item, and put semicolons between the items.

Answer: *We met Ana, the captain; Leo, the goalie; and Sam, the coach.*

## Common mistakes and fixes

| Mistake | Fix |
| --- | --- |
| Using a semicolon where a colon belongs | If a list or explanation follows, and the second part is not a full sentence, use a colon. |
| Putting a comma before *however* between two sentences | Use a semicolon before *however* and a comma after it. |
| Using semicolons to sound smart | Use one only when it does one of its three jobs. A period is always fine. |
| Capitalizing the word after a semicolon | Lowercase it unless it is a proper noun or the word *I*. |

## Practice

**Five semicolon questions**

1. Which sentence uses a semicolon correctly?
   A. Because the library was closed; we studied at home.
   B. The library was closed; we studied at home.
   C. The library; was closed, so we studied at home.
   D. We studied; at home because the library was closed.

   Answer: The library was closed; we studied at home.. Both sides are complete sentences, so the semicolon works. *Because the library was closed* cannot stand alone, and *The library; was closed* and *We studied; at home* split a sentence in the middle.

2. Which sentence is punctuated correctly?
   A. The forecast called for rain, however, the game went on.
   B. The forecast called for rain however; the game went on.
   C. The forecast called for rain; however, the game went on.
   D. The forecast called for rain, however the game went on.

   Answer: The forecast called for rain; however, the game went on.. *However* begins the second sentence, so use a semicolon before it and a comma after it. A comma before *however* makes a comma splice, and a semicolon after it attaches *however* to the wrong sentence.

3. Which sentence follows the rule for a list whose items contain commas?
   A. The tour visits Austin, Texas; Denver, Colorado; and Portland, Oregon.
   B. The tour visits Austin; Texas, Denver; Colorado, and Portland; Oregon.
   C. The tour visits Austin, Texas; Denver, Colorado, and Portland, Oregon.
   D. The tour visits; Austin, Texas, Denver, Colorado, and Portland, Oregon.

   Answer: The tour visits Austin, Texas; Denver, Colorado; and Portland, Oregon.. Each item is a city and state with a comma inside, so semicolons go between the items. *Austin; Texas* splits cities from their states, *Colorado, and Portland* puts a comma back between items, and *visits; Austin* puts a semicolon before the list.

4. Which sentence uses a semicolon incorrectly?
   A. I love to cook; my brother loves to eat.
   B. The road was icy; therefore, school was canceled.
   C. We met Ana, the captain; Leo, the goalie; and Sam, the coach.
   D. She packed three things; a tent, a stove, and a map.

   Answer: She packed three things; a tent, a stove, and a map.. *A tent, a stove, and a map* is a list, not a complete sentence, so it needs a colon. The other three use a semicolon for one of its three correct jobs.

5. What is the best way to fix this comma splice: *The power went out, we lit candles.*
   A. The power went out; we lit candles.
   B. The power went out we lit candles.
   C. The power; went out, we lit candles.
   D. The power went out, we, lit candles.

   Answer: The power went out; we lit candles.. Both sides are complete sentences, so a semicolon can join them. Removing the comma makes a run-on, and the other choices put punctuation inside the sentences.

## Frequently asked questions

### What is the difference between a semicolon and a colon?

A semicolon joins two complete sentences of equal weight. A [colon](https://duckyhelper.com/learn/grammar/colons/) comes after a complete sentence and points to what follows: a list, an example or an explanation. If what follows is a list or a single phrase, you want a colon, not a semicolon.

### Can I use a semicolon with and or but?

Normally no: use a comma before *and* or *but* when they join two sentences. Some style guides allow a semicolon before *and* or *but* when the sentences are long and already full of commas, but that is rare. In school writing, the comma is the safe choice.

### Do I capitalize after a semicolon?

No, unless the next word is a proper noun like *Maria* or the word *I*. A semicolon joins parts of one sentence, so the second part continues in lowercase.

## Sources

- [Purdue OWL, Commas vs. Semicolons](https://owl.purdue.edu/owl/general_writing/punctuation/commas/commas_vs_semicolons.html), accessed 2026-10-01
- [Purdue OWL, Semicolons, Colons, and Parentheses](https://owl.purdue.edu/owl/multilingual/multilingual_students/punctuation/semicolons_colons_and_parentheses.html), accessed 2026-10-01

## Related

- [How to use a colon](https://duckyhelper.com/learn/grammar/colons/)
- [Comma rules](https://duckyhelper.com/learn/grammar/commas/)
- [SAT punctuation: Boundaries questions](https://duckyhelper.com/learn/sat-reading-writing/boundaries-punctuation/)
- [Grammar study guides](https://duckyhelper.com/learn/grammar/)

## Try asking Ducky

- "Find the comma splices in my essay and let me choose how to fix each one."
- "Should this be a semicolon or a colon? Explain it with my sentence."
- "Give me five sentences to fix with semicolons."

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