dous

two

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

en

• Prep

  1. in
  2. when preceding a verb or a complement of a verb it can denote an unfinished or continued action

• Adv

caso

first-person singular present indicative of casar

de

1. of, from
2. of; -'s (belonging to)

fallo

defect; fail