The essence of the English language is the sentence. A sentence is a grammatically self-contained group of words that expresses a statement, a question, a command, a wish, or an exclamation. It is composed of a subject, about which something is said, and a predicate, which expresses what is said about the subject. The subject can be a single noun, a noun phrase, such as “the strong wind,” or a noun clause, such as “what he decides is important to all of us.” The predicate can be a single verb, a verb phrase, such as “will be going,” a verb and all its modifiers, such as “will be going as soon as the bus going,” a verb and its complements, such as “gave his client the bad news.”

In English, word order is important. The subject usually comes first, but not necessarily:

An amusement park is across the river.

Across the river is an amusement park.

Is an amusement park across the river?

The grammar of English is concerned with the structure of these elements that make up a sentence. Every word in a sentence can be classified as a particular part of speech (noun, verb, adjective, etc.), according to its function in the sentence.

From the Merriam Webster Dictionary

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