The first one is a 1978-80 GM mid-size coupe, I believe it is an Olds Cutlass Supreme based on the shape of the front end. The other plausible guess is the Pontiac Grand Prix, but I do not see a pointy front end.

Second one is a 1988-91 Ford Crown Victoria.

Third one is a Cadillac Eldorado from the 1979-85 years. I think it is from the newer years than a 1979-81 model, but I am not certain.