Questions & Answers about Za taj popravak trebam alat: odvijač i mali čekić.
Za here means for in the sense of for the purpose of (e.g., for that repair). In this meaning, za is followed by the accusative case: za taj popravak.
Popravak is a masculine noun (ending in a consonant), so the demonstrative must match it:
- masculine: taj (that) → taj popravak
- feminine would be ta, neuter would be to.
Also, popravak is inanimate masculine, so its accusative singular looks the same as nominative: popravak (not popravka).