# Run-on Sentences: Examples & How to Fix It

> A run-on sentence joins two or more complete thoughts with no punctuation or joining word. Fix it by adding a period, a semicolon, or a comma plus a conjunction between the clauses.

**URL:** https://humanit.app/writing/run-on-sentence  ·  **Updated:** May 2026  ·  Humanit

A run-on sentence joins two or more complete thoughts with no punctuation or joining word. Fix it by adding a period, a semicolon, or a comma plus a conjunction between the clauses. Paste your own sentence into the free checker below to fix it in one click.

## How it works

1. **Spot the pattern** — Read the sentence aloud. If you naturally pause where there’s no punctuation — and the part after the pause could stand alone — you’ve found a run-on.
2. **Apply the rule** — Separate the clauses: end the first with a period, link them with a semicolon, or add a comma and a conjunction (and, but, so).
3. **Check your sentence** — Paste your text into the grammar checker below — it flags the issue and shows the correction.
4. **Re-read it** — Read the corrected version aloud to confirm it says exactly what you meant.

## The rule

When two independent clauses run together without any punctuation or coordinating conjunction, the sentence is a run-on (also called a fused sentence). Each clause needs proper separation.

## How to spot it

Read the sentence aloud. If you naturally pause where there’s no punctuation — and the part after the pause could stand alone — you’ve found a run-on.

## How to fix it

Separate the clauses: end the first with a period, link them with a semicolon, or add a comma and a conjunction (and, but, so).

## The most common mistake

Confusing length with run-ons. A long sentence can be perfectly correct; a short one (“I love coffee I drink it daily”) can still be a run-on. If you’re not sure whether your sentence has the problem, paste it into the checker above — it catches this and explains the fix in plain language.

**Before → after**

| ❌ Incorrect | ✓ Corrected | Why |
| --- | --- | --- |
| I love coffee I drink it daily. | I love coffee. I drink it daily. | Period separates the clauses |
| The bus was late she missed class. | The bus was late, so she missed class. | Comma + conjunction |
| He trained hard he won the race. | He trained hard; he won the race. | Semicolon links related clauses |

## FAQ

**What is a run-on sentence?**

Two or more complete sentences fused with no punctuation or joining word — for example, “It rained all day we stayed inside.” It needs a period, semicolon, or conjunction.

**What’s the difference between a run-on and a comma splice?**

A run-on has no punctuation between the clauses; a comma splice has a comma but no conjunction. Both are fixed the same three ways.

**How do I check my own writing for this?**

Paste your text into the free grammar checker on this page. It flags the issue, suggests a correction, and explains why — so you learn the rule, not just the fix.

**Is it free?**

Yes — your first run needs no account, and a free account adds 5 more, each up to 1,500 words. They are a one-time grant, not a daily allowance. Upgrade for a word pool that removes the per-run cap, or use the free iOS app.

## Related pages

- [Parallel Structure](https://humanit.app/writing/parallel-structure) ([markdown](https://humanit.app/writing/parallel-structure.md))
- [Reduce Wordiness](https://humanit.app/writing/reduce-wordiness) ([markdown](https://humanit.app/writing/reduce-wordiness.md))
- [Formal vs Informal Sentences](https://humanit.app/writing/formal-vs-informal) ([markdown](https://humanit.app/writing/formal-vs-informal.md))
- [Comma Splices](https://humanit.app/writing/comma-splice) ([markdown](https://humanit.app/writing/comma-splice.md))
- [AI Humanizer](https://humanit.app/humanize) — Rewrite AI text to read human. ([markdown](https://humanit.app/humanize.md))
- [AI Detector](https://humanit.app/detect) — Check if text reads as AI-written. ([markdown](https://humanit.app/detect.md))

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_Last updated: June 2026._