Fioka koju smo poravnali sada je stabilna.

to be

Breakdown of Fioka koju smo poravnali sada je stabilna.

• danas: today
• koji: that (relative pronoun)
• fioka: a drawer

Questions & Answers about Fioka koju smo poravnali sada je stabilna.

Why is it koju, not koja?

Because koju is a relative pronoun, and its case depends on its role inside the relative clause.

• fioka is feminine singular
• inside koju smo poravnali, that pronoun is the direct object of poravnali
• so it must be feminine singular accusative: koju

If it were the subject of the relative clause, you would use koja instead.

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What exactly is koju smo poravnali doing in the sentence?

It is a relative clause: it describes fioka.

The sentence can be broken down like this:

• Fioka ... je stabilna. = The drawer ... is stable.
• koju smo poravnali = that/which we aligned

So the full structure is:

• Fioka = the noun
• koju smo poravnali = extra information about that noun
• sada je stabilna = the main statement about it now

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What tense is smo poravnali?

It is the perfect tense in Serbian:

• smo = auxiliary verb to be for we
• = past participle