Questions & Answers about Daj mi odvijač kojim mogu da zategnem vijak.
Because mi is the unstressed dative form of ja and means to me.
In this sentence, the speaker is the person who should receive the screwdriver, so Serbian uses the indirect object:
- Daj mi odvijač = Give me the screwdriver / Give the screwdriver to me
Mene is a different form of ja and would not be used for this role here.
It is changing case, but for a masculine inanimate noun like odvijač, the accusative singular looks the same as the nominative singular.
So:
- odvijač = nominative singular
- odvijač = accusative singular
That is normal in Serbian for masculine inanimate nouns.
The same thing happens with vijak in this sentence.
Compare that with a masculine animate noun:
- čovek → vidim čoveka
It is a relative clause describing which screwdriver the speaker wants.
So the sentence does not mean just any screwdriver. It means: