"كان" is an Arabic verb that means "to be" or "was." It is used to indicate the existence or state of something in the past. In sentences, "كان" helps to describe situations, characteristics, or actions that occurred before the present time. It is an essential verb in Arabic grammar and is often used in various tenses and forms. In addition to its basic meaning, "كان" can also be used to express habitual actions in the past. For example, when describing what someone used to do or how things were, "كان" provides context and clarity. Understanding "كان" is crucial for mastering Arabic sentence structure and conveying past events effectively.