The Present Perfect is used to describe actions that happened before now but are still relevant in the present. It often uses words like already, yet, ever, never, just, since, and for. These words help show time, experience, or duration. For example, already is used to show something happened earlier than expected, while yet is used in questions and negatives. Ever is used when asking about life experiences, and never means “at no time.” Just refers to very recent actions. Since shows the starting point of an action, and for shows how long the action has continued.