You don't necessarily have to know the difference between a gerund and a dangling participle to be a good mentor, but helping students to create a stronger writer's voice is a big part of the mentoring process. The students will be doing everything from short stories to expository essays to poetry, and your comments will vary from piece to piece. On the creative pieces, working with form, dialogue, characterizations, plot, symbolism will all take place. On the essays, helping students prove arguments and write structured essays will be important. That's still my job.
Input is always welcome, though.
The main mentor page will have all the due dates for all three classes posted for everyone to see, but more importantly, the mentor list-serv will be the place that new assignments are announced and discussed. Student writing can get very personal and very powerful, which can make it very hard to respond to critically. First, do not carry on a discussion with a student where you feel really uncomfortable. Trust that instinct. Remember, you are not alone.