Answer me:
Whether you're the "do-er" or "do-ee"
It's the "do-er" we call "subject", see?
For "subject": "who"; yes, "who" is he [1]

Listen, son
Is it you on whom it's being done?
That's the "object"; use the other one:
"Whom do you trust?" (I trust you, Hon!) [2]

If... you... do the thing,
(C'mon, sing!) then you are "who"
If... it's... done to you
"Whom" is true
"Whom did she sue?" [3]

More good news:
Here's the difference 'tween "who's" and "whose"
If belongs to someone, "Whose", we use
The "who's" contraction might confuse

"Who's" ... re-...-place the "i"
On the sly; "apostrophe"
"Who... is... there?" ("Who's there?")
Who's aware?; Who can tell me?.....

Whose is this?
Say, to whom belongs this choc'late kiss? [4]
Who now understands? Don't be remiss
No more will you write these amiss

And isn't learning grammar bliss?



[1] If there is an "is" verb ("am", "are", "be", etc.), we always use the "subject" form ("May I speak with TT?" "This is he" or "Who is it?" "It is I"), but that's a "subject" for another parody, so to speak :-)

[2] The old game show, "Who do you trust?" used to make a lot of us cringe. (OK, it made only a few of us cringe.)
Questions can be tricky to parse. TTip: Put the words back into the order of a simple statement: (subject) (verb) (object).
So, "Who/whom do you trust?" becomes "You" (subject) "do trust" (verb) "who/whom".
"You do trust who/whom?" We now can see that the "who/whom" is an "object". It's the thing that is being trusted; the thing on which we are lavishing our trust. Therefore, since it's an "object", we use the "object" form, "whom".
"You do trust whom?" = "Whom do you trust?" Simple, no?

[3] Same as [2]. "She did sue whom? = "Whom did she sue?"

[4] "This chocolate kiss" (subject) "belongs" (verb) to "whom" (object, with preposition "to") = "To whom" (object, even though at the beginning, as is often true of questions) "belongs" (verb) "this chocolate kiss" (subject, "kiss", specifically, this chocolate one, not that cherry one). Questions?