Questions & Answers about Poculum ex argento factum est.
Poculum is nominative singular neuter.
It is the subject of the sentence: the thing that was made.
The dictionary form is also poculum, meaning cup or goblet.
Because it is neuter singular, any adjective or participle agreeing with it must also be neuter singular, which is why we get factum.
Because ex is a preposition meaning out of / from, and it takes the ablative case.
So:
- argentum = silver, in the nominative/accusative form
- argento = silver, in the ablative singular
In this sentence, ex argento means out of silver or more naturally from silver / made of silver.
It is ablative because the preposition ex requires the ablative.
This is a very common Latin pattern:
- ex urbe = out of the city
- ex aqua = out of water
- ex argento = out of silver
So the case is not chosen randomly; it is required by the preposition.