eran

third-person plural imperfect indicative of ser

seres

second-person singular personal infinitive of ser

por

1. indicates motion
2. for (over a period of time)
3. about, around (near, in the vicinity of)
4. for (to obtain)
5. for (in exchange for)
6. for (on behalf of)
7. times, by, multiplied by
8. by (indicates the actor in a clause with its verb in the passive voice)
9. by, by means of
10. per

un

• Article

  a, one

• Num