Sestava je krátká.

to be

Breakdown of Sestava je krátká.

• krátký: short
• sestava: the dance routine

Questions & Answers about Sestava je krátká.

Why does krátká end in -á here?

Because krátká has to agree with sestava.

In Czech, adjectives change their endings to match the noun in:

• gender
• number
• case

Sestava is:

• feminine
• singular
• nominative

So the adjective also has to be feminine singular nominative:

• masculine: krátký
• feminine: krátká
• neuter: krátké

That is why krátká is correct here, not krátký.

What is je, and why is it needed?

Je is the 3rd person singular form of the verb být (to be).

So:

• já jsem = I am
• ty jsi = you are
• on/ona/ono je = he/she/it is

In Sestava je krátká, je means is.

It is needed because this is a normal Czech sentence with a subject and a predicate:

• Sestava = the subject
• je krátká = is short

Unlike in some languages, you normally do use být in this kind of sentence in Czech.