Go is often called the shortest complete sentence in English, since it contains both a subject and a verb.

The longer version

An imperative verb carries its own understood subject, so Go already contains both halves of a clause: the unspoken you that is being addressed and the action demanded of that person. English drops the pronoun in commands rather than inserting it, which is what lets a two-letter word count as grammatically complete.

Other candidates compete for the same title. I am needs three letters, Stop implies the same invisible you, and a language such as Latin would compress the whole idea into a single inflected word. The record therefore says less about brevity than about how a sentence is defined: once you allow an unstated subject, imperatives win by default.

Where this entry sits

This category gathers small surprises about the English language, from odd spelling rules to words that quietly hide their own history. Expect palindromes, punctuation oddities, borrowed terms, and the strange ways writing systems record spoken speech. The full list sits on the Words and Language page, where every entry is listed in order.