One of the most frustrating grammar topics encountered on the SAT and ACT (and in life in general, really) is the correct use of subject and object pronouns—specifically when to use who (subject pronoun) and when to use whom (object pronoun). Who cares, you might ask? (Or should that be "Whom cares?") But getting this right is easy, and getting it wrong can cost you points, so it's worth reviewing.

Here's a simple, non-technical way to tell the difference between a subject and an object: The subject of a sentence or independent clause is the thing doing the action; the object is that thing that the action is done to. Simple, right? Here's an example:

After a large bouquet of pink roses was clandestinely delivered to the sorority house, the girls were in a frenzy all afternoon, as no one knew the sender of the bouquet, nor for whom it was intended.