Recently Craig Lancaster wrote about pet peeves and whether we really should be holding onto them so tightly. I’m guilty of dozens of peeves and have bitten my tongue blue trying to be polite to my family who are equally guilty of misusing my peeves; sometimes deliberately. Craig’s post reminded me that we had some Ask the Editor questions about the proper use of who, whom, which, and that . These are some of my favourites, so, even though these were answered in the comments of that post, I thought I’d add my little memory tricks for determining the proper use of these words in context. Who and Whom Quick fix:  Switch "who" and "whom" with "he" and "him" - if you can use “ him ” then you can use “ whom ”, in most cases. "He is the author. I like him." "He is the author whom I like." It seems "whom" is falling away from general use. What do you think? Should we stop using it altogether, or should we try to pr...