Upali svjetlo u hodniku, molim te.

Here upali means turn on.

It comes from the verb upaliti, which often means to switch on, to light, or literally to ignite, depending on context. With svjetlo (light), it is the normal way to say turn the light on.

So:

• upaliti svjetlo = to turn on the light

In everyday Croatian, this is very natural.

Because upali is the imperative form: a command directed to one person.

• upaliti = infinitive, to turn on
• upali! = imperative, turn on!

So the sentence is giving a direct instruction or request.

This is about aspect, which is very important in Croatian.

• paliti = imperfective
• upaliti = perfective

In commands for a single completed action, Croatian often prefers the perfective verb.
So Upali svjetlo means something like Turn the light on (now, as one complete action).

By contrast, Pali svjetlo would sound less natural in this situation, unless the context specifically called for the imperfective.

So for a normal one-time request, upali is the expected choice.

Svjetlo is in the accusative case, because it is the direct object of the verb upali.

You are turning on what?
→ svjetlo

However, for this noun, the nominative and accusative forms are the same:

• nominative: svjetlo
• accusative: svjetlo

That is common with many neuter singular nouns in Croatian.

Because Croatian does not have articles like English a/an/the.

So Croatian simply says:

• svjetlo = light / the light
• hodnik = hallway / the hallway

The exact meaning depends on context. In this sentence, English naturally uses the: Turn on the light in the hallway, please.

Hodniku is in the locative singular.

The phrase u hodniku means in the hallway, and here it expresses location, not movement.

So:

• u + locative = in, at (location)
• u + accusative = into, to (movement toward)

Compare:

• u hodniku = in the hallway
• u hodnik = into the hallway

Since the light is located in the hallway, Croatian uses u hodniku.

In Croatian, u is usually used for being inside an enclosed space or in a room/area, so u hodniku is the normal choice for in the hallway.

• u hodniku = in the hallway

You may sometimes hear na hodniku in some contexts or regional usage, often with a slightly different sense such as out in the corridor, but u hodniku is the standard and safest choice here.

Molim te means please when speaking to one person informally.

Literally, it is related to I ask/beg you, but in normal speech it simply functions as please.

Breakdown:

• molim = I ask / I beg
• te = you (singular, informal, object form)

So molim te is the usual polite way to soften a request to one person you address as ti.

Yes. Croatian word order is fairly flexible, and molim te can appear in different positions.

For example:

• Upali svjetlo u hodniku, molim te.
• Molim te, upali svjetlo u hodniku.
• Upali, molim te, svjetlo u hodniku.

All of these are possible. The version with molim te at the end is very natural and common.

You would use molim vas instead of molim te.

• molim te = please (to one person, informal)
• molim vas = please (to one person formally, or to several people)

So:

• Upali svjetlo u hodniku, molim te. = informal, one person
• Upalite svjetlo u hodniku, molim vas. = formal singular or plural

Notice that the verb also changes:

• upali = imperative for ti
• upalite = imperative for vi

This is a very common learner question.

The noun svjetlo means light.

• svjetlo = light (noun)

But svijetlo is usually the adverb or related form from the adjective svijetao, meaning lightly, brightly, or part of forms connected with light/pale color.

Also compare:

• svjetlo = light
• svijetao / svijetla / svijetlo = light-colored, pale, bright

So in this sentence, the correct noun is svjetlo.

Yes, absolutely.

Both are possible:

• Upali svjetlo = turn on the light
• Uključi svjetlo = turn on the light

In everyday Croatian, upaliti svjetlo is extremely common and very natural.
Uključiti is also correct, but it can sound a bit more general or more mechanical/electrical, depending on context.

For lights, many speakers will naturally prefer upaliti.

Yes, svjetlo can be tricky for English speakers because of the consonant cluster.

A rough guide:

• sv as in saying s
  • v together
• je sounds roughly like ye
• tlo sounds like tlo, with a clear tl cluster

So it is approximately:

• svjetlo ≈ svyet-lo

Try building it step by step:

• sve
• then tighten it to svje
• then add tlo → svjetlo

The important thing is not to insert extra vowels like suh-vye-te-lo. Croatian keeps the cluster compact.

Grammatically, it is an imperative, so it is a command form. But because it includes molim te, in actual use it sounds more like a polite request than a harsh command.

So the tone is:

• Upali svjetlo. = more direct
• Upali svjetlo, molim te. = softer, polite, natural

In everyday conversation, this would usually be understood as a normal request.