Rado ću ostaviti laptop.

Rado means gladly, willingly, or with pleasure.

In this sentence, it shows the speaker’s attitude toward the action: they are willing or happy to do it.

For learners, it is easiest to think of rado as an adverb-like word used with verbs.

• Rado čitam. = I gladly read / I like reading.
• Rado ću pomoći. = I’ll gladly help.

It does not change form here.

Because ću is a clitic (an unstressed short form), and in Serbian clitics usually go in the second position of the sentence or clause.

So in:

Rado ću ostaviti laptop.

the first stressed element is rado, and the clitic ću comes right after it.

This is a very common Serbian pattern:

• Sutra ću doći.
• Možda ću zvati.
• Rado ću ostaviti laptop.

You normally cannot place ću at the very beginning by itself.

Serbian often drops subject pronouns when they are already clear from the verb form.

Here, ću already tells you the subject is I.

So:

• Rado ću ostaviti laptop.
• Ja ću rado ostaviti laptop.

Both can mean the same thing, but adding ja usually gives emphasis, for example:

• Ja ću ostaviti laptop, a on neće.
  = I will leave the laptop, but he won’t.

Without emphasis, leaving out ja is completely normal.

This is the future tense formed with:

• the clitic form of hteti (ću)
• plus the infinitive (ostaviti)

So:

• ću = I will
• ostaviti = to leave

Together:

• ću ostaviti = I will leave

This is a standard Serbian future construction.

A few forms of the clitic are:

• ću = I will
• ćeš = you will
• će = he/she/it will
• ćemo = we will
• ćete = you (plural/formal) will
• će = they will

Because ostaviti is perfective, while ostavljati is imperfective.

In Serbian, this difference is very important:

• ostaviti = to leave, as a completed single act
• ostavljati = to be leaving / to leave repeatedly or habitually

In a sentence about one future completed action, ostaviti is the natural choice:

• Rado ću ostaviti laptop.
  = one complete act in the future

If you used ostavljati, it would suggest repetition, habit, or ongoing action, which usually does not fit this sentence as well.

Yes.

In Serbian, future forms like this can often appear in two ways:

• Ja ću ostaviti laptop.
• Ostaviću laptop.

Both are correct.

When the clitic attaches to the infinitive, the final -i of the infinitive drops:

• ostaviti + ću → ostaviću

But in your sentence, because rado comes first, the natural structure is:

• Rado ću ostaviti laptop.

You would not normally write Rado ostaviću laptop.

It is in a case here: it is the accusative, because it is the direct object of ostaviti.

The reason it looks unchanged is that masculine inanimate nouns in Serbian often have:

• nominative = accusative

So:

• laptop (nominative)
• laptop (accusative)

That is completely normal.

Compare:

• Vidim laptop. = accusative, but same form
• Imam laptop.
• Ostaviću laptop.

If it were a masculine animate noun, the accusative would usually look different.

Yes, laptop is very commonly used in Serbian as a loanword.

It behaves like a regular masculine noun and can be declined:

• laptop
• laptopa
• laptopu
• etc.

In your sentence, it happens to appear in a form that looks the same as the basic dictionary form.

You may also hear kompjuter, but laptop is specifically a laptop, not just any computer.

Yes, Rado ću ostaviti laptop is natural.

Serbian word order is fairly flexible, but changing it changes emphasis.

For example:

• Rado ću ostaviti laptop.
  Neutral, with focus on willingness.

• Laptop ću rado ostaviti.
  More emphasis on the laptop.

• Ja ću rado ostaviti laptop.
  More emphasis on I.

Because ću is a clitic, it still wants to stay near the second position, so word order is flexible, but not completely free.

Ostaviti is a broad verb, and the exact nuance depends on context.

It can mean things like:

• leave something somewhere
• leave behind
• leave for someone
• let someone keep
• sometimes even stop/quit in other contexts

So in this sentence, the exact English wording depends on the situation. It could mean:

• leaving the laptop somewhere
• leaving it behind
• leaving it for someone else

The Serbian sentence itself does not force only one of those meanings. Context tells you which one is intended.

No, not in normal Serbian.

Use rado with verbs to mean gladly / willingly.

Drago is used in different structures, such as:

• Drago mi je. = I’m glad.
• Drago mi je što si došao. = I’m glad you came.

So:

• Rado ću ostaviti laptop. = correct
• Drago ću ostaviti laptop. = not natural / not correct here

This is a very common learner confusion, so it is good to notice the difference early.