Kada uključim veliko svetlo, u sobi više nema mraka.

to have

Breakdown of Kada uključim veliko svetlo, u sobi više nema mraka.

• velik: big
• u: in
• ne: not

Questions & Answers about Kada uključim veliko svetlo, u sobi više nema mraka.

Why is it uključim and not uključujem?

This is about verb aspect.

• uključiti = perfective verb, meaning to switch on / turn on as a completed action
• uključivati / uključujem = imperfective verb, meaning to be switching on, to switch on repeatedly, or focusing on the process/habit

In the sentence Kada uključim veliko svetlo..., the speaker means:

• when I turn on the main light
• or whenever I turn on the main light

So Serbian uses the perfective present very naturally here.

A useful thing to know:

• after kada meaning when, Serbian often uses a present form of a perfective verb where English may use present or future-like meaning

Examples:

• Kada dođem, zvaću te. = When I arrive, I’ll call you.
• Kada uključim svetlo, sve se vidi. = When I turn on the light, everything can be seen.

So uključim is correct because it refers to the completed moment of turning the light on.

Does kada uključim mean when I turn on, when I switch on, or whenever I turn on?

It can mean either when I turn on or whenever I turn on, depending on context.

In Serbian, kada + present can be: