Minorgliche

Its a 2001 civic sedan Lx. No mods whatsoever. 5,500 miles (my cousin don't drive much). Last time she drove it was 4 days ago. Didnt notice any problems. This morning it wouldn't start. The battery should be fine, b/c lights turn on. When i try to start it, it cranks up but the engine does not start. Tried jump starting it , same thing happens. i did searches but don't quite understand all the terminalogy. How do i kno if its the fuel pump that is the problem? Can i hear/see it when its working? Can it be the spark plugs? Hopefully it wont cost too much to fix. Freaking warrenty expired exactly 2 days ago. Any help will greatly be appreciated. Thanks