up a table just to talk about it. >> because i love grammar so much. >> reporter: you couldn't think of anything more interesting? ( laughs ) >> but it's the anchor. like, right now, we're using words. this wouldn't even be happening. we would just be looking at each other. >> reporter: by day, ellen jovin runs a company training people in business communications. but her real passion is linguistics. she has a huge library of grammar and style books, from arabic to zulu. to share the knowledge and have some fun, last year, she began setting up her grammar table around new york city where she lives, and it went so well, she is now taking the table to the collective noun that is america. >> on the road around the country. >> reporter: we caught up with her here in new hope, pennsylvania, where ellen spent the day reminding people how to diagram sentences... >> i bet you remember this. >> reporter: ...explaining when to use who and whom... >> whom, and do you know why? >> reporter: ...and counseling people on their comma addictions. >> are you a comma user? >> yes, i am. i probably overuse them. >> we have a little bit more of an urge to leave them out sometimes.