Kad budem našla rešenje, poslaću ti poruku.

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Breakdown of Kad budem našla rešenje, poslaću ti poruku.

• poslati: to send
• poruka: message
• hteti: will

Questions & Answers about Kad budem našla rešenje, poslaću ti poruku.

Why does Serbian use budem našla here instead of something like ću naći?

Because this sentence has two future actions, and the first one must happen before the second one:

• kad budem našla rešenje = when I find / when I have found the solution
• poslaću ti poruku = I will send you a message

In Serbian, when a future action in a subordinate clause is completed before another future action, Serbian often uses Future II in the subordinate clause. That is what budem našla is.

So the structure is:

• Kad budem našla rešenje, ... = When I have found the solution, ...
• ... poslaću ti poruku. = ... I will send you a message.

In natural English, we usually just say When I find the solution, I'll send you a message.

What exactly is budem?

Budem is the 1st person singular form used in Future II.

The Future II is formed with:

• budem / budeš / bude / budemo / budete / budu
• plus the past participle of the main verb

So here:

• budem našla

This is different from the ordinary present-tense auxiliary sam. You would not say Kad sam našla rešenje if you mean the future.

A useful mini-paradigm:

• budem našao / našla
• budeš našao / našla