The private pilot and a certificated flight instructor were conducting a flight review. While on final approach to the runway, the airplane passed over trees and began to sink. The pilot receiving the flight review was unable to recover from the sink with power and the airplane touched down in a field about 60 feet prior to the runway threshold, collapsing the left main landing gear. The airplane continued onto the runway, veered to the left, and back onto the grass, collapsing the right main and nose landing gear.