Το άλμπουμ είναι καινούριο.

Word by word:

• Το = the
  It is the neuter singular definite article.

• άλμπουμ = album
  This is the noun.

• είναι = is
  This is the 3rd person singular form of to be.

• καινούριο = new
  This is the adjective describing άλμπουμ.

So the structure is:

article + noun + verb + adjective
= The album is new.

Το is the definite article, meaning the.

Greek articles change depending on:

• gender
• number
• case

Here, άλμπουμ is neuter singular, and in this sentence it is the subject, so the correct article is το.

Some common singular definite articles are:

• ο for masculine
• η for feminine
• το for neuter

So:

• το άλμπουμ = the album

Yes. Άλμπουμ is treated as a neuter noun in Greek.

That is why it goes with:

• το = neuter singular the
• καινούριο = neuter singular new

Many borrowed words in Greek are neuter, and άλμπουμ is one of them.

Because Greek adjectives usually agree with the noun they describe in:

• gender
• number
• case

Since άλμπουμ is:

• neuter
• singular
• here functioning as the subject

the adjective also appears in the neuter singular form:

• masculine: καινούριος
• feminine: καινούρια
• neuter: καινούριο

So:

• το άλμπουμ είναι καινούριο

This is the same basic idea as saying the new book, the new house, etc., except Greek shows the agreement more clearly in the adjective ending.

Because here καινούριο comes after the verb είναι and works as a predicate adjective:

• Το άλμπουμ είναι καινούριο = The album is new

When an adjective is used this way in Greek, it normally does not take an article.

Compare:

• το καινούριο άλμπουμ = the new album
  Here the adjective is directly attached to the noun, so the article appears with the noun phrase.

• το άλμπουμ είναι καινούριο = the album is new
  Here the adjective is part of the predicate after είναι.

A simple learner-friendly pronunciation guide would be:

• Το ≈ toh
• άλμπουμ ≈ AL-boom
• είναι ≈ EE-ne
• καινούριο ≈ keh-NOO-ree-oh

A few notes:

• The accent mark shows the stressed syllable:
  • άλμπουμ
  • είναι
  • καινούριο
• In normal speech, είναι is often pronounced a bit more quickly, roughly like EE-ne.

Greek uses an accent mark to show which syllable is stressed.

In this sentence:

• άλμπουμ → stress on άλ
• είναι → stress on εί
• καινούριο → stress on νού

Stress matters in Greek pronunciation, so it is important to learn words together with their accent marks.

Yes. Καινούριο and καινούργιο are both common forms meaning new.

So both of these are possible:

• Το άλμπουμ είναι καινούριο
• Το άλμπουμ είναι καινούργιο

Likewise in other genders:

• καινούριος / καινούργιος
• καινούρια / καινούργια
• καινούριο / καινούργιο

A learner will hear both. The sentence you were given uses καινούριο, which is perfectly natural.

Yes, often you can.

• Το άλμπουμ είναι καινούριο
• Το άλμπουμ είναι νέο

Both can mean The album is new.

However, there can be a slight nuance:

• καινούριο often clearly means brand-new / not old / newly bought
• νέο can also mean new, but depending on context it may sound a bit broader, like new as opposed to old, or new/current/latest

In many everyday situations, either works.

Because Greek often does not need subject pronouns when the meaning is already clear.

In English, you must say:

• It is new

In Greek, the verb form often makes the subject clear enough, and in this sentence the noun itself is already present:

• Το άλμπουμ είναι καινούριο

So there is no need for a separate word meaning it.

If you wanted just It is new, you could say:

• Είναι καινούριο

if the context already makes clear what it refers to.

The given order is the most neutral and natural:

• Το άλμπουμ είναι καινούριο

Greek word order is often more flexible than English, though changes in order usually change emphasis.

For example, you might also hear:

• Καινούριο είναι το άλμπουμ

This puts more emphasis on καινούριο.

But for a basic statement, the version you have is the best one to learn first.

Normally, no. That would sound incomplete or unnatural in a simple sentence like this.

Greek usually wants the article with a noun when you mean the album:

• Το άλμπουμ είναι καινούριο

Leaving the article out is only possible in certain special contexts, not as the normal equivalent of The album is new.

So for learners, the safe choice is:

• το άλμπουμ = the album

Yes. The common plural is:

• singular: το άλμπουμ
• plural: τα άλμπουμ

So the noun itself often stays the same, but the article changes:

• Το άλμπουμ είναι καινούριο = The album is new
• Τα άλμπουμ είναι καινούρια = The albums are new

Notice that the adjective also changes to match the plural:

• καινούριο → καινούρια for neuter plural in this kind of everyday usage.