Argh!!! when is group project going to end!!!

kind of sick doing group project.. not pair work.. but those group project with 4 or more people doing it!!! hate it! not everyone is putting in effort for it.. some may give lot of idea but some just sit. worst thing is they do their on research and keep to themselves.. sometime they know they right in some point but just remain silent.. if u think u're right about something, just voice out! it's noting wrong!!!