Υπάρχουν εκατό μονάδες.

Υπάρχουν means there are or exist.

It is the plural form of the verb υπάρχω (to exist / to be there).

So:

• Υπάρχει = there is
• Υπάρχουν = there are

In this sentence, it introduces the existence of εκατό μονάδες.

Because μονάδες is plural.

Greek uses:

• Υπάρχει with singular nouns
• Υπάρχουν with plural nouns

Compare:

• Υπάρχει μία μονάδα. = There is one unit.
• Υπάρχουν εκατό μονάδες. = There are one hundred units.

So the verb agrees in number with the noun phrase.

Μονάδες is the plural of μονάδα (unit).

More specifically, it is the nominative plural form here, because it is the subject of the sentence.

Forms:

• η μονάδα = the unit
• οι μονάδες = the units

In Υπάρχουν εκατό μονάδες, μονάδες means units in a general sense.

Because Greek, like English, often omits the article with numbers when speaking generally.

So:

• εκατό μονάδες = one hundred units

This is normal and natural.

If you added an article, it would usually make the phrase more specific or marked in context, not the basic neutral form.

No. Εκατό (one hundred) is normally indeclinable in Modern Greek, which means it does not change form for gender, case, or number.

So you use εκατό the same way with different nouns:

• εκατό μονάδες = one hundred units
• εκατό άνθρωποι = one hundred people
• εκατό βιβλία = one hundred books

A rough pronunciation is:

ee-PAR-hoon eh-ka-TO mo-NA-thes

More carefully:

• Υπάρχουν = ee-PAR-hoon
• εκατό = eh-ka-TO
• μονάδες = mo-NA-thes

A few useful notes:

• The stress is shown by the accent marks: υπάρχουν, εκατό, μονάδες
• χ in υπάρχουν is a Greek sound like the ch in Scottish loch or German Bach
• δ in μονάδες is like the th in this, not like English d

Not exactly.

• Υπάρχουν means there are / exist
• είναι means are / is

In many English translations, both can sound similar, but the Greek usage is different.

For example:

• Υπάρχουν εκατό μονάδες. = There are one hundred units.
• Οι μονάδες είναι εκατό. = The units are one hundred / The number of units is one hundred

The first sentence presents existence.
The second says something about already known units.

Yes. Greek word order is more flexible than English.

The neutral order here is:

• Υπάρχουν εκατό μονάδες.

But you may also see:

• Εκατό μονάδες υπάρχουν.

That version is possible, but it sounds more marked or emphatic, as if drawing attention to one hundred units.

So for a basic learner sentence, Υπάρχουν εκατό μονάδες is the best standard pattern.

The singular version would be:

• Υπάρχει μία μονάδα. = There is one unit.

Changes:

• Υπάρχουν → Υπάρχει
• μονάδες → μονάδα
• add μία for one

You could also say Υπάρχει μια μονάδα, with μια being the common less formal spelling of μία.

It is in the nominative.

Even though English uses the pattern there are + noun, in Greek the noun after υπάρχει / υπάρχουν is still the grammatical subject, so it appears in the nominative.

So in:

• Υπάρχουν εκατό μονάδες

μονάδες is nominative plural.

Μονάδες is a very general word meaning units. Its exact meaning depends on context.

It can refer to things like:

• mathematical units
• military units
• housing units
• machine units
• course units or credit units
• pieces in a system or inventory

So the sentence is grammatically simple, but the noun itself is quite flexible in meaning.

Yes, grammatically you could, because υπάρχουν literally relates to existence.

But in normal English, There are one hundred units is much more natural.

So:

• literal-ish sense: There exist one hundred units
• natural English: There are one hundred units

The accent marks show which syllable is stressed.

• υπάρχουν → stress on PAR
• εκατό → stress on TO
• μονάδες → stress on NA

In Modern Greek writing, accents are important because they help you pronounce words correctly and can sometimes distinguish forms.