have to change
Tengo que cambiar de tren en Madrid.
I have to change trains in Madrid.
I have to change.
Tengo que cambiar las llantas.
I need to change the tires.
I have to change schools.
Tengo que cambiar una cuerda a la guitarra.
I need to change a string on the guitar.
Tengo que cambiar el pañal del bebé.
I have to change the baby's diaper.
I need to change my clothes.