John says: There are a lot of commas missing in your essay!
a- Really? Where in my essay should I have used a comma that I haven't?
b- Really? Where in my essay should I have used a comma and I haven't?
Are the sentences (a) and (b) both acceptable in the context of this dialogue?
This is the place to post questions and discussions on usage and style. The members of the Wordwizard Clubhouse will also often be able to help you to formulate that difficult letter.
End of topic.