Comparisons using pronouns

<p>I just read this on sparknotes and do not understand this at all.</p>

<p>"Comparisons Using Pronouns
Take special notice whenever you see a comparison made using pronouns. When a pronoun is involved in a comparison, it must match the case of the other pronoun involved:
I’m much stronger than her , which is good, because it means I’ll dominate this wrestling match.
In this sentence, I is being compared to her. These two pronouns are in different cases, so one of them must be wrong. Since only her is underlined, it must be wrong, and therefore it’s the right answer."</p>

<p>Can anyone explain to my why that happens? I never knew saying "I'm much better than him" etc was grammatically incorrect:S</p>

<p>Well, I can't help you exactly, but I and she are the nominative/subject cases, whilst me and her are object/accusative cases.</p>

<p>You must say:</p>

<p>I am better than she [is].</p>

<p>right...if you take the sentence "I'm much better than him" you're comparing "I" with "him"...you need to either be comparing "I" and "he", or "me" with "him" (obviously in this sentence it's "I" with "he")</p>

<p>i don't know how to explain it in all the fancy grammatical terms...but basically, you use "I" and "he" for the same purposes in sentences...and you use "him" and "me" for the same purposes in sentences...but you cant "cross borders" by comparing I with him or he with me</p>

<p>it also might help you conceptually if you flip the sentence around...
"Him is better than I [am]" vs "He is better than I [am]"</p>

<p>thanks for the quick responses guys</p>

<p>Yeah, it's basically like this:</p>

<p>I am stronger than he [is].</p>

<p>I like Bob better than [I like] him.</p>

<p>So you just try to fill in the missing parts, and you can essentially tell whether the pronoun in question should be objective or subjective given that context.</p>