This objective case of the first-person pronoun I is used as a direct or indirect object. While many people mistakenly use I in examples such as The book belongs to you and I, the grammatically correct form of this sentence is The book belongs to me. If you're ever unsure which of these first-person pronouns to use, remove the other party from the sentence. Does the book belong to I? No! It belongs to me.

Some 400 years ago, owing to the tendency that the word following the verb position in a sentence is object rather than subject territory, me and other objective pronouns (him; her; us; them) began to replace the subjective forms after be, so that It is I became It is me. Today such constructions-It's me. That's him. It must be them.-are almost universal in speech, the context in which they usually occur. In formal speech or edited writing, the subjective forms are often used: It was I who first noticed the problem. My brother was the one who called our attention to the problem, but it wasn't he who solved it. It had been she at the window, not her husband.

Me and other objective forms have also replaced the subjective forms in speech in constructions like Me neither; Not us; Who, them? and in comparisons after as or than: He's no faster than her at getting the answers. When the pronoun is the subject of a verb that is expressed, the nominative forms are used: Neither did I. He's no faster than she is at getting the answers.

In formal speech or edited writing, gerunds (verbs ending in -ing which function as nouns) are proceeded by the possessive form of the pronoun or noun (my; your; her; his; its; our; their; child's; author's) rather than by the objective forms (me; you; him; her; it; us; them): The landlord objected to my (not me) having guests late at night. Several readers were delighted at the author's (not author) taking a stand on the issue. In standard practice, however, both objective and possessive forms appear before gerunds. The occurrence of objective forms is increasing; in informal writing and speech objective forms are more common: Many objections have been raised to the government (or government's) allowing lumbering in national parks. Does anyone object to me (or my) reading this report aloud?