A run-on sentence is a common error caused by merging two sentences (i.e., independent clauses) without suitable punctuation. When a comma is used incorrectly between the two sentences, the error is known as a comma fault or a comma splice.
Examples of Run-on Sentences
Here are some examples of run-on sentences:
It is raining heavily the game is cancelled.
(This is a run-on sentence. It is made up of two standalone sentences. They cannot run from one to the other without punctuation.)
You can collect as many signatures as you like, the reservoir is still going to be built.
(This is a run-on sentence. It is made up of two standalone sentences. You cannot join them with a comma.)
Lee had all the best tackle, however, he failed to catch a single fish.
(The word however is a major cause of run-on sentences. When used as a bridge to the previous clause, the word however should start a new sentence or be preceded by a semicolon — definitely not a comma.)
Fixing Run-on Sentences
There are several ways to fix a run-on sentence. Look at this example: