Dosent want to turn over even wen I put starter fluid

do you know for sure, 100% that there is gas in the fuel tank? turning over means the engine is cranking over.if that's the case and it's not cranking,then it has nothing to do with fuel if it ain't cranking the engine over? if it is cranking and starting with the starting fluid,then cuts off after it burns the fluid,then it's fuel related...