Questions & Answers about 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.