The Case of the Squirrelly Pronouns

Some grammarians used to say that nouns in English were in the nominative or objective case, depending on whether they served as subjects or as objects — this regardless of their unchanging forms. Nouns can be singular or plural in English, but they can’t be in the nominative or objective case. They’re said to be in the common case. In fact, the only English words that have differences in the nominative and objective cases are pronouns, and we have six pairs of them:

I/me we/us he/him she/her they/them who/whom