Read the following selection, and identify any errors.

Checking punctuation before sending your massage is important. When you proofread for punctuation errors make sure that introductory clauses are followed by commas, that compound sentences put commas before coordinating conjungations, and that semicolons and colons are used corectly.

This selection contains three misspelled words and one comma error.

This selection contains two spelling errors, one run$-$on sentence, and one comma error.

This selection is correct without any revisions.