Yes, a summary can definitely have 3 sentences. In fact, a 3-sentence summary is a common format for concisely conveying the main points of a longer text. However, it's important to remember that a 3-sentence summary may not be suitable for all types of texts, especially very complex or lengthy ones. The goal of a summary is to capture the essence of the original text, and sometimes 3 sentences might not be enough to do that effectively.
