Το κεραμικό είναι μικρό.

Because κεραμικό is neuter singular here, and the Greek definite article has to match the noun’s gender and number.

• ο = masculine singular
• η = feminine singular
• το = neuter singular

So το κεραμικό is the correct form.

In this sentence, κεραμικό is functioning as a noun.

Greek often allows a word that can be an adjective to also be used as a noun, depending on context. So κεραμικό can mean something like:

• a ceramic object
• a ceramic piece
• a pottery item
• sometimes a ceramic tile, depending on context

If it were used as an adjective, it would normally describe another noun, as in:

• το κεραμικό πιάτο = the ceramic plate

But in Το κεραμικό είναι μικρό, it stands alone as the subject.

It is in the nominative case, because it is the subject of the sentence.

A useful detail: in the neuter singular, the nominative and accusative forms are often the same, so the form itself does not change here. You know it is nominative because of its job in the sentence: it is the thing that is small.

είναι is the 3rd person singular present tense of είμαι = to be.

So here it means is.

It works for:

• he is
• she is
• it is

Greek verbs do not change for gender, so είναι stays the same whether the subject is masculine, feminine, or neuter. It only depends on person and number.

Because the adjective has to agree with the noun in gender, number, and case.

Since κεραμικό is neuter singular, the adjective must also be neuter singular:

• μικρός = masculine singular
• μικρή = feminine singular
• μικρό = neuter singular

So Το κεραμικό είναι μικρό is correct.

Because μικρό is a predicate adjective here: it comes after είναι and describes the subject.

In Greek, predicate adjectives normally do not take an article.

Compare:

• Το κεραμικό είναι μικρό.
  The ceramic object is small.

• το μικρό κεραμικό
  the small ceramic object

In the second example, μικρό is directly attached to the noun, so it is part of the noun phrase. In the original sentence, it is not part of the noun phrase; it comes after είναι.

No, Greek word order is more flexible than English word order.

The neutral, straightforward order is:

• Το κεραμικό είναι μικρό.

But other orders are possible for emphasis, for example:

• Μικρό είναι το κεραμικό.

That puts more emphasis on μικρό.

For a learner, the safest default is the original order:

• subject + είναι + adjective

The accent marks show which syllable is stressed.

• κεραμικό → stress on the last syllable
• είναι → stress on the first syllable
• μικρό → stress on the last syllable

A rough pronunciation guide:

• το κεραμικό είναι μικρό
• to ke-ra-mi-KO EE-ne mi-KRO

The accent marks are important in Greek, because stress is part of the standard spelling.

Usually not if you mean the ceramic object.

Greek uses the definite article very regularly, and in this sentence το is part of the normal way to say it. If you remove it, the sentence may sound incomplete, unnatural, or may suggest a different structure.

So for this meaning, keep:

• Το κεραμικό είναι μικρό.

Not always. By itself, κεραμικό can be a bit broad, and the exact meaning often depends on context.

It might refer to:

• a ceramic object
• a pottery piece
• a ceramic item
• sometimes a tile or other ceramic piece, depending on the situation

So the grammar is clear, but the exact real-world object may need context. That is normal in Greek, just as in English some words can be broad unless the situation makes them specific.