Poklon za rođendan je već kupljen.

The birthday present has already been bought.

Breakdown of Poklon za rođendan je već kupljen.

• biti: to be
• za: for
• rođendan: birthday
• već: already

Questions & Answers about Poklon za rođendan je već kupljen.

What does each word in Poklon za rođendan je već kupljen do in the sentence?

Here is the role of each part:

• poklon = gift, present
  It is the main noun and the subject of the sentence.

• za = for
  This preposition is used here in the sense of purpose or intended occasion.

• rođendan = birthday
  Together with za, it makes za rođendan = for a birthday / for the birthday.

• je = is
  This is the 3rd person singular present form of biti (to be).

• već = already

• kupljen = bought
  More exactly, it is a passive past participle meaning bought in the sense has been bought / is bought already.

So the structure is basically:

[The birthday gift] [is] [already] [bought].

Why is it za rođendan and not some other form like za rođendana?

Because the preposition za normally takes the accusative case when it means for.

So:

• za + accusative

The noun rođendan is a masculine inanimate noun. In the singular, masculine inanimate nouns often have the in the nominative and accusative.