Objective pronoun
An objective pronoun functions as the target of a verb, as distinguished from a subjective pronoun, which is the initiator of a verb. Objective pronouns are instances of the oblique case.
In English, many pronouns are different from their corresponding subjective pronouns: I/me, we/us, he/him, she/her, who/whom, and they/them.
English once had an extensive declension system that specified distinct pronouns for accusative and dative cases. This collapsed into a single pronoun for both accusative and dative cases, now called the objective pronoun. See declension in English.
Regional differences
Several relatively common usages of objective pronouns in the subject position are regarded as errors by prescriptive grammarians, though descriptive grammarians class such usages as dialect and a natural part of language evolution. Various dialects of American English in particular often disregard subjective/objective pronoun distinctions in certain cases.
For example, to use the objective pronoun in a compound subject, regardless of whether it is a subject or object, is considered grammatically incorrect in Queen's English:
Incorrect: You and me are going to school together.
Correct: You and I are going to school together.
Correct: The teacher teaches you and me.
Also, using the objective pronoun for the second word in a comparison with the conjunction than, regardless of whether it is a subject or object, is similary regarded as incorrect in Queen's English. This rule is very often disregarded in American English, to the point where a sentence constructed using "proper" grammar can, in some cases, be perceived as artificial or archaic to a native speaker of American English.
Incorrect: You are a better swimmer than her.
Correct: You are a better swimmer than she.
Correct: They like you more than her.
