not because ... but because ...
Hice eso, no porque quisiera, sino porque tenía que hacerlo.
I did that, not because I wanted to, but because I had to.
No porque fuera incapaz, sino porque tomaba la droga opuesta al personaje.
Not because he was incapable, but because he was taking the opposite drug to the character.
— Dolor y gloria (2019)
No lo hice porque lo necesitase, sino porque me apetecía.
I didn’t do it because I needed to, but because I felt like it.
No lo he hecho porque quisiera, sino porque tenía que hacerlo.
I didn’t do it because I wanted to, but because I had to.
Quiero comprar este libro no porque sea barato sino porque es útil.
I want to buy this book not because it's cheap, but because it's useful.
No quiero comprar este libro porque sea barato sino porque es útil.
I don't want to buy this book because it's cheap, but because it's useful.
Soy un vegetariano, no por amar a los animales, sino porque odio a las plantas.
I am a vegetarian, not because I love animals, but because I hate plants.
Él me gusta no porque sea amable, sino porque es honesto.
I like him not because he's kind, but because he's honest.