how do u say 'was built'?
ex: El Arc de Triomf 'was built' en 1888.
Try the conjugation or translation link on this site and see what you can come up with. Give it a try and then I'm sure others will help out. That's the fun in learning!!
passive voice- a little more difficult to do in Spanish
In this case you wish to use ser+past participle or the pronominal verb
since you wouldn't readily find your answer let me give you the answer and then you can ask questions about it if you don't understand anything.
fue construido (ser+past participle)
se contruyó (pronominal usage)