Το ζώο είναι ημίαιμο.

Το is the definite article here. It means the and agrees with ζώο in gender, number, and case.

In this sentence:

• το = neuter singular definite article
• ζώο = neuter singular noun

Greek uses the article very regularly, so learners should get used to seeing nouns together with their article: το ζώο.

You can tell from the article το, which is the neuter singular definite article.

So when you learn the noun, it is best to learn it as:

• το ζώο

That tells you the noun is neuter. In Greek, grammatical gender is part of the noun, and it does not necessarily match biological sex. So ζώο is grammatically neuter even though the animal itself could be male or female.

Είναι is the present-tense form of είμαι, meaning to be.

Here it works like English is:

• Το ζώο είναι ημίαιμο.

A useful thing to know: in Modern Greek, είναι is used for both:

• he/she/it is
• they are

So the same word appears with both singular and plural subjects.

Yes. Ημίαιμο is an adjective in this sentence.

It is describing το ζώο, so it has to agree with it. Since ζώο is neuter singular, the adjective is also neuter singular:

• το ζώο → neuter singular
• ημίαιμο → neuter singular

This is very common in Greek: adjectives change form to match the noun they describe.

Because ημίαιμο is a predicate adjective after είναι.

In English, we say:

• The animal is mixed-breed.

Greek works the same way here:

• Το ζώο είναι ημίαιμο.

After είναι, Greek normally uses the adjective without an article when it is simply describing the subject.

Το ζώο is the subject, so it is in the nominative.

The adjective ημίαιμο is also in the nominative, because after είναι, predicate adjectives normally match the subject in:

• gender
• number
• case

So the structure is:

• το ζώο = nominative neuter singular
• ημίαιμο = nominative neuter singular

It is pronounced in two syllables, roughly:

• ZO-o

The stress is on the first syllable: ζώο.

A common mistake is to try to compress it too much, but both vowels are heard. So it is not a one-syllable word.

Yes, Greek word order is more flexible than English, but the sentence as written is the most neutral and natural order:

• Το ζώο είναι ημίαιμο.

You may sometimes see different orders for emphasis, but for a learner, this standard pattern is the best one to use:

• subject + είναι + adjective

You would say:

• Τα ζώα είναι ημίαιμα.

Notice what changes:

• το → τα
• ζώο → ζώα
• ημίαιμο → ημίαιμα

But είναι stays the same. This is a very useful pattern to notice in Greek.