Breakdown of Ova boca je od stakla.
biti
to be (sam, si, je)
ovaj
this (m) / ova (f), ovo (n)
boca
bottle
od
from
Questions & Answers about Ova boca je od stakla.
Why do we use od here instead of iz?
We use od when talking about the material something is made of, like glass in this sentence. The preposition iz is usually used when something comes out of a specific place or container, like a city or a box.
What is the dictionary form of stakla?
The dictionary form is staklo, which is a neuter noun. It changes to stakla here because the preposition od always requires the genitive case. For neuter nouns ending in -o, the genitive ending is -a.
I learned ovo means this. Why is it ova boca in this sentence?
If you just want to introduce an object by saying "This is a bottle", you use the fixed neutral phrase Ovo je boca. But because we are saying "This bottle...", the word for "this" must match the feminine gender of the noun boca. Therefore, it changes to the feminine form ova.