"I am" is the shortest complete sentence in English that includes both a subject and a verb.

English grammar requires an independent clause to make a full sentence. This means the sentence must have a subject and a verb to stand on its own. The word "I" is the subject pronoun. The word "am" is a form of the verb "to be."This sentence follows the Subject-Verb pattern. It is the simplest way to build a sentence in English. While the word "Go!" has fewer letters, it is a command. In a command, the subject "you" is hidden or understood rather than written out.Linguists call "I am" a declarative sentence. It makes a statement about existence. The Oxford English Dictionary recognizes this two-word structure as grammatically complete. It meets all the formal rules of the English language.The verb "am" is a linking verb. It connects the subject to a state of being. This phrase is also linked to the philosopher René Descartes. In 1637, he wrote "I think, therefore I am" to prove his own existence.