The document discusses imperative sentences in English. Imperative sentences request or command someone to do or not do something. They can be commands, requests, invitations, or warnings depending on intonation. Examples are given of positive imperative sentences using verbs without "to" and negative ones using "don't." Adverbs of place can be added. Imperatives imply "you" as the subject. "Do" can make commands more polite. Imperatives can signal the speaker's participation with "let's." Imperatives function to give direct orders, warnings, advice, instructions, or requests.