Ergonomska stolica je udobna.

to be

Breakdown of Ergonomska stolica je udobna.

• udoban: comfortable
• ergonomska stolica: an ergonomic chair

Questions & Answers about Ergonomska stolica je udobna.

Why do both ergonomska and udobna end in -a?

Because they both agree with stolica, which is a feminine singular noun.

In Croatian, adjectives must match the noun they describe in:

• gender
• number
• case

Here:

• stolica = feminine, singular, nominative
• ergonomska = feminine singular nominative
• udobna = feminine singular nominative

So the -a ending is showing agreement with stolica.

This is true both for:

• ergonomska in front of the noun: ergonomska stolica
• udobna after je: stolica je udobna

What is je doing in this sentence?

Je is the 3rd person singular present tense of the verb biti (to be).

So:

• ja sam = I am
• ti si = you are
• on/ona/ono je = he/she/it is

In Ergonomska stolica je udobna, je means is.

It links the subject ergonomska stolica with the description udobna, just like English is in The ergonomic chair is comfortable.