which of the following is a run-on sentence? the house was owned by the mayor. mike joined the army, an he became more disciplined during the training. Karen's uncle arrives tomorrow she wants to see him. we like to take a walk after dinner.

Read carefully, and then let us know what you think.

http://grammar.ccc.commnet.edu/grammar/runons.htm

the house was owned by the mayor.

mike joined the army, an he became more disciplined during the training.

Karen's uncle arrives tomorrow she wants to see him.

we like to take a walk after dinner.

The run-on sentence among the options you provided is: "Mike joined the army, an he became more disciplined during the training."

To identify a run-on sentence, we need to check if two or more independent clauses (complete sentences) are improperly joined without appropriate punctuation or conjunctions. In this case, the sentence includes two independent clauses ("Mike joined the army" and "he became more disciplined during the training") without any proper punctuation or conjunction between them.

To correct this run-on sentence, you can use a coordinating conjunction (such as "and") or separate the clauses into two separate sentences. So, a corrected version could be: "Mike joined the army, and he became more disciplined during the training" or "Mike joined the army. He became more disciplined during the training."