is the body of rules that describe the structure of expressions in the English language. This includes the structure of words, phrases, clauses and sentences. A text that contains more than one sentence is no longer in the realm of grammar, but is instead is in the realm of discourse.[1]

The grammar of a language is approached in two ways: descriptive grammar is based on analysis of text corpora and describes grammatical structures thereof, whereas prescriptive grammar attempts to use the identified rules of a given language as a tool to govern the linguistic behaviour of speakers. This article predominantly concerns itself with descriptive grammar.

There are historical, social and regional variations of English. Divergences from the grammar described here occur in some dialects of English. This article describes a generalized present-day Standard English, the form of speech found in types of public discourse including broadcasting, education, entertainment, government, and news reporting, including both formal and informal speech. Although British English, American English and Australian English have several lexical differences, the grammatical differences are not as conspicuous, and will be mentioned only when appropriate.

Grammar is divided into morphology, which describes the formation of words, and syntax, which describes the construction of meaningful phrases, clauses, and sentences out of words.