here the story driving the car everything is fine all of a sudden the rpm go up, so i check and it s in gear, pull to the side and try to go forward , it's always in neutral , standard transmission, why?

 

You might be low on transmission fluid, causing it to slip. Or a bad clutch. Maybe your gears just feel like they're always in neutral because you need new shifter bushings. I don't know much, but you can start checking these things.