What is a Run-on Sentence? A run-on sentence consists of two or more main clauses that are run together without proper punctuation. Sometimes even sentences which are technically correct are easier to read if they are made into shorter sentences. We often speak in run-on sentences, but we make pauses and change our tone so people can understand us. But when we write, no one can hear us, so sometimes we must break our sentences into shorter units so that they do not sound run-on.
Semicolons and periods can be used to break up the run-on sentence.
Incorrect: The boy showed us his tickets someone gave them to him.
Correct: The boy showed us his tickets. Someone gave them to him.
Incorrect: It was a beautiful day there was not a cloud in the sky.
Correct: It was a beautiful day; there was not a cloud in the sky.