TPACK idea

My mentor teacher wants me to teach writing while really focusing on conventions such as punctuation, capital letters, etc. My idea is to use the promethean board to have several examples of sentences that contain errors and then have the students come up to underline or circle the errors they can see. I would use the shade tool to show the incorrect sentence and then lower it to reveal how the sentence should look. This would be an improvement because several sentences could be done in a short amount of time and the students' attention could be held longer.