Καταχωρίζω το ζώο.

A rough pronunciation is:

ka-ta-ho-REE-zo to ZO-o

More precisely in IPA:

/kataxoˈrizo to ˈzo.o/

A few helpful notes:

• χ in καταχωρίζω is the Greek sound /x/, like the ch in German Bach or Spanish j in José.
• ζώο has two vowel sounds: ZO-o, not one syllable.
• The stressed syllables are marked by the written accents:
  • καταχωρίζω
  • ζώο

Because -ω is the usual ending for the 1st person singular present tense in many Greek verbs.

So:

• καταχωρίζω = I register / I record / I enter

This ending tells you the subject is I, so Greek does not need a separate word for I unless you want emphasis.

Compare:

• καταχωρίζω = I register
• καταχωρίζεις = you register
• καταχωρίζει = he/she/it registers

Greek often drops subject pronouns when they are not necessary, because the verb ending already shows who is doing the action.

So:

• Καταχωρίζω το ζώο. = I register the animal.
• Εγώ καταχωρίζω το ζώο. = I register the animal.

The version with εγώ is more emphatic, like stressing I in English.

το is the definite article, meaning the.

In Greek, the article changes depending on:

• gender
• number
• case

Here:

• το ζώο = the animal

Because ζώο is a neuter singular noun, its article is το.

In Greek, every noun has a grammatical gender: masculine, feminine, or neuter. This is a grammar category, and it does not always match biological sex.

ζώο happens to be a neuter noun, so it goes with:

• το ζώο = the animal

Even if the animal is male or female in real life, the noun ζώο is still grammatically neuter.

Yes. In Καταχωρίζω το ζώο, το ζώο is the direct object — the thing being registered.

So the structure is:

• Καταχωρίζω = verb = I register
• το ζώο = direct object = the animal

In English, word order is what mainly tells you the object. In Greek, word order helps too, but the article and noun forms also play an important role.

Because for this noun, the nominative and accusative singular look the same.

For neuter nouns in Greek, this is very common.

So:

• το ζώο can mean the animal as a subject
• το ζώο can also mean the animal as an object

You understand its role from the sentence:

• Το ζώο τρέχει. = The animal runs.
  Here it is the subject.
• Καταχωρίζω το ζώο. = I register the animal.
  Here it is the object.

It usually means something like:

• register
• record
• enter
• log
• file

The exact English translation depends on context.

For example, it could be used for:

• entering data into a system
• registering an item officially
• recording information in a list or database

So in different contexts, Καταχωρίζω το ζώο might be understood as:

• I register the animal
• I record the animal
• I enter the animal into the system

Yes. Greek word order is more flexible than English word order.

The most neutral order here is:

• Καταχωρίζω το ζώο.

But you may also see:

• Το ζώο καταχωρίζω.

That changed order usually adds emphasis or reflects the flow of the conversation.

English is less flexible, so you usually keep:

• I register the animal.

Use δεν before the verb:

• Δεν καταχωρίζω το ζώο. = I do not register the animal.

A few notes:

• δεν is the standard negation word for statements.
• It normally comes right before the verb.

In Greek, you usually make a yes/no question mainly through intonation, not by changing word order.

So:

• Καταχωρίζω το ζώο; = Am I registering the animal? / Do I register the animal?

In writing, Greek often uses the semicolon (;) as the question mark:

• Καταχωρίζω το ζώο;

So if you see ; in Greek, read it as ?

It can mean either one, depending on context.

So:

• Καταχωρίζω το ζώο. can mean:
  • I register the animal
  • I am registering the animal

Greek present tense often covers both the simple present and the present continuous that English separates.

If the context is happening right now, English may prefer I am registering the animal. If it is more general or habitual, English may prefer I register the animal.

In Modern Greek, ω and ο are both pronounced /o/, so they do not sound different.

But Greek spelling preserves older distinctions, so you still have to learn which letter a word uses.

In ζώο:

• ώ shows the stressed o
• the final ο is a separate vowel sound

So the word is pronounced in two syllables:

• ζώ-ο

Not ζο as a single syllable.

You would use the plural:

• τα ζώα = the animals

So the full sentence would be:

• Καταχωρίζω τα ζώα. = I register the animals.

Notice the changes:

• το → τα
• ζώο → ζώα