There are several ways to make requests and give instructions to others. "Could you", "Will you", and "Would you" can be used, with "Could you" being the most polite. "Will you" and "Would you" are normally used by people in authority. Imperatives like "Stop" and "Go away" are not very polite but are commonly used with close friends and family. Phrases like "I would like you to" and "I'd like you to" can also be used to make polite requests.