1. Attend: This word emphasizes participating in or attending meetings, conferences, or academic activities.2. Join: It is a general term that means to become a part of a group, organization, or activity. For example, "join the army" means to enlist in the military.3. Join in: This phrase means to take part in an activity. For example, "Can I join in the game?" means "Can I participate in the game?"4. Participate: This is a formal term that specifically refers to taking part in group activities and implies a positive role in doing so. For example, "participate in a competition, discussion, meeting" means to take part in a competition, discussion, or meeting.5. Take part in: This phrase emphasizes participating in a mass, collective endeavor, work, or activity and highlights the role the participant plays. For example, "take part in an activity" means to participate in an activity.Additional Information: The phrase "take part in" is more formal than "join in" and implies a greater level of involvement or contribution to the activity.