El piloto tuvo un mal rendimiento en la clasificación y largará la carrera en el penúltimo lugar.The pilot didn't do well in the qualification and will start the race in the penultimate position.
Es el penúltimo día del semestre, y todavía no terminaste tu ensayo.It's the second to last day of the semester and you still haven't finished your essay.
Le vendieron la última entrada al penúltimo de la fila, y yo estaba detrás.The last ticket was sold to the last but one in line, and I was just behind him.