<p>can someone explain in normal terms when I use who and when i use whom? is there a trick to remember the proper grammar?</p>
<p>In simplest terms, who is a subject and whom is an object.</p>
<p>The easiest way to test this is to answer the question with he/him. If he works then the answer is who; however, if him works the answer is whom.</p>
<p>E.G.
Who/whom picked up the trash? - He picked up the trash. Answer is who.
Who/whom does this package belong to? - It belongs to him. Answer is whom.</p>
<p>^ Yes, that’s correct.</p>
<p>In order to justify “who” as correct, you need to be able to point to a verb whose subject is “who.” In “Who picked up the trash?” the one verb is “picked” and the subject is “Who.” But in “Whom does this package belong to?” the single subject is “belong”: it is the package, not “Whom,” that belongs [to someone].</p>