How do I fix a run-on sentence?

A run-on sentence contains at least two independent clauses that have been joined without proper punctuation or conjunctions.

Run-on: I asked her to bring soft drinks she did not.

There are three separate cures:

  1. Separate the run-on sentence into two sentences with a period.

    I asked her to bring soft drinks. She did not.

  2. Separate the clauses with a comma and coordinating conjunction.

    I asked her to bring soft drinks, but she did not.

  3. Separate the clauses with a semicolon.

    I asked her to bring soft drinks; she did not.