2001 Mitsubishi Diamante loss of all oil

My wife was driving our car and stopped at a red light when someone came up to her and told he all of the oil was on the ground. She turned it off and had it pushed to a lot. Come to find out all the oil had leaked out and the transmision fluid was gone. I put 4 quarts of oil and some transmission fluid in it and let it run. The car wouldn't catch a gear and the oil flowed out again. Can you tell me what the problem could be.