Who vs. Whom

A grammar error I have never understood was the who vs. whom. It always confused me, making me think that whom is past tense and who is present. So to solve the problem I looked at a website called grammar girl, which gave me a simple way to remember it.

Who is the subject of the sentence and Whom is the object of the sentence, meaning that who is the doer and whom is the one being something done to. Additionally, you can remember it by asking the question would it be him or he. So if you were to ask "who(or whom) do i love?" you would answer "I love him," therefore making it whom. Then vice-versa, if you were trying ask "who(or whom) stepped on squiggley?" you would say "he stepped on squiggley," therefore making it who.

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