Questions & Answers about Moj deda je još živ.
- moj = my; a possessive adjective
- deda = grandfather / grandpa; the subject
- je = is; the 3rd person singular of biti (to be)
- još = still
- živ = alive
So the structure is basically:
my grandfather + is + still + alive
A useful thing to notice is that živ is an adjective used after je, just like alive in English.
Yes, Serbian can leave it out if the context already makes it clear whose grandfather you mean.
- Moj deda je još živ. = My grandfather is still alive.
- Deda je još živ. = Grandpa / Grandfather is still alive.
Using moj makes the possession explicit. In English, my is often required, but in Serbian it is more optional when the relationship is obvious from context.
This is because je is a clitic in Serbian. Clitics are short unstressed words that usually go in the of the sentence or clause.