cutch problem on 1996 Pontiac Sunfire

my clutch drops to the floor. then i have to pump it up,and as i drive the car it keeps drifting back down. fluid is full.

Asked by for the 1996 Pontiac Sunfire
it can only be a couple of things. Clutch master cyl. is shot. Clutch slave cyl. is shot. Or there is a leak in the line connecting the 2.