Run-On Sentences: How to Fix Them

Quick Answer

A run-on sentence joins two independent clauses without the right punctuation or conjunction.

Fix it with a period, semicolon, or comma + coordinating conjunction.

Memory Trick: Two complete thoughts need a clean break.

🔑 Key Takeaway

Independent clauses must be separated by punctuation or a conjunction.

Quick Comparison

Focus	What to Check	Why It Matters
Main rule	Run-On Sentences: How to Fix Them	Start with the quick answer before applying the rule in a sentence.
Final check	Compare the sentence against the examples on this page.	This helps you avoid choosing a form or rule too early.

Common Mistakes

❌ Incorrect:

Applying run-on sentences: how to fix them without checking what the sentence is doing.

✓ Correct:

Use the quick answer first, then confirm the rule with the examples on this page.

A run-on sentence joins two independent clauses without the right punctuation or conjunction. Fix it with a period, semicolon, or comma + coordinating conjunction.

🎯 Test Your Knowledge

1. What should you check first when applying Run-On Sentences: How to Fix Them?

Answer: A run-on sentence joins two independent clauses without the right punctuation or conjunction. Fix it with a period, semicolon, or comma + coordinating conjunction.

Frequently Asked Questions

What should I remember about Run-On Sentences?

A run-on sentence joins two independent clauses without the right punctuation or conjunction. Fix it with a period, semicolon, or comma + coordinating conjunction.

What quick test helps me with Run-On Sentences?

Two complete thoughts need a clean break.

What should I check before using Run-On Sentences?

Independent clauses must be separated by punctuation or a conjunction.

Real-World Examples

See how these words work in genuine contexts — from business emails to academic papers.

❌ Run-on:

I love coffee I drink it every morning.

Two independent clauses with no punctuation = run-on

❌ Comma Splice:

I love coffee, I drink it every morning.

Two independent clauses joined by just a comma = comma splice (a type of run-on)

✅ Fix 1: Period:

I love coffee. I drink it every morning.

Split into two sentences

✅ Fix 2: Semicolon:

I love coffee; I drink it every morning.

Semicolon for closely related clauses

✅ Fix 3: Conjunction:

I love coffee, so I drink it every morning.

Add a coordinating conjunction after the comma

💡 Detection:

If you can split the sentence into two complete sentences, check that they're properly joined.

The split test catches most run-ons and comma splices

Why Do People Confuse Them?

Run-on sentences aren't about length — a short sentence can be a run-on ('I run he walks'), and a long sentence can be perfectly correct. The issue is joining independent clauses without proper punctuation or conjunctions.

For more practice, review Its vs It's and Subject-Verb Agreement.

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Run-On Sentences: Fix Comma Splices and Fused Sentences