It's Fuerte for man and woman same as one person or other but if you have multiple-choice and is not in there then it has to be Fuertoso singular and for plural fuertes or fuertosos. they are less common do.
Hope I had helped.
Answer:
yo: construía
tu: construías
el, ella, usted: construía
nosotros: construíamos
vosotros: construíais
ellos, ellas, ustedes: construían
vos: construías
Yo use Spanish Dict and translate it all to English
No es sagrado, ha perdido su valor al paso de los siglos y las personas no lo concideran un puente sagrado.
