My car wont start... the battery and starter are fine and it sounds like its trying to turn over but no signs of combustion in the motor. Any theories?

i was driving my car we stopped at a light it had stalled try to start again nothing car was running fine took the car to garage checked fuel pump lots of pressure no engine compression timming belt jumped its cheaper to change motors than timing belt i got engine for 450.00 to change belt and gears cylinder head with new valves you can pay 2.000 if not more check your fuel pump first its easier good luck