2003 Chevy cavalier

Nisha, if you are SURE the fuses are good, then you will have to get an electrical tester for 12 volt and see if there is power at the plug connector at the light with the lights on. if not you will have to probe the wire going in to the plug to see if there is power there. It could just be the electrical connector at the bulb socket. if you have no power at the socket and none in the wire coming to the socket, then you probably have a wire broken somewhere else .

Where do I get an electrical tester

any auto parts store, and you can probably find a youtube video on how to use it. not hard.