[Wrong] I don’t know whether my concern is valid or I am merely projecting my insecurities onto him. My favorite reference book is Anne Stilman’s Grammatically Correct: The Writer’s Essential Guide to punctuation, spelling, style, usage and grammar. You could make that correct like this: "Broad knowledge is why my friends are proud of me." – Andrea Oct 12 '15 at 8:02. I bought myself a new car!. This is still ambiguous as to whether there are 2 or 3 people going shopping. Couldn't you still run into the same problem using "My oldest friend, Jessie, and I went shopping."? You do not need to wrap the friend's name in commas – unless that friend is your only friend.