Traduzca: Who could it be?
¿Quién fue?
¿Quién es?
¿Quién será?
¿Quién ser?

Quien Sera? = who could it be?

Explanation:

from a Native Spanish speaker

hope  i helped

Quién sería?

Who was?

Who is?

Who will be?

Quién ser - this is a mistake. It is like saying “who be.”

Explanation:

read the following texts. text 1 electoral marketing consists of implementing integrated political marketing and social communication techniques, in order to gain the approval and sympathy of the society, building a solid image of the candidate and being able to transmit reliability and safety to the population by raising its concept at the level of public opinion. therefore, electoral marketing is concerned with the formation of the image in the short term. catarin, roberto bianchi. electoral propaganda in media democracy: the victory of emotion in the 2014 presidential election in brazil. 2016. dissertation (masters in communication) - school of communication, education and humanities, methodist university of são paulo, são paulo, 2016 (158 p.)