It could be a broken cambelt. It would be a good idea to check to make sure the camshaft is still turning before we go any further.
You will need to look to see the cam turning by removing the inspection cover and watching while someone cranks the engine on the key.
Does it have spark at the plug?
You can use a spark plug connected to number one lead and the metal body of the plug against the cylinder head.
Get someone to try and start the car while you check to see if the spark jumps the gap.
Have you checked for fuel further back up the fuel line.
Is the power getting to the pump?
Can you hear the pump,p whirr?