[QueenBee2011]

I think for this you really need to teach through reading. As they listen to you read, use expression or don't, incorrect pausing, run on sentences. When they hear it, they should be able to stop you and say "That's not right". It will be a fun way for them to learn this. Then read aloud what they've written and see if they hear it. Finally, have them read their own writing and the writing of others. Sometimes you need to hear it to learn it!