Fermentace a kynutí jsou důležité.

to be

Breakdown of Fermentace a kynutí jsou důležité.

• a: and
• důležitý: important
• kynutí: the proofing; rising

Questions & Answers about Fermentace a kynutí jsou důležité.

Why is jsou used here instead of je?

Because the subject is plural: Fermentace a kynutí = fermentation and leavening/proofing.
When two things are joined by a (and), Czech normally treats them as plural, so the verb být (to be) must also be plural:

• je = is
• jsou = are

So:

• Fermentace je důležitá. = Fermentation is important.
• Kynutí je důležité. = Leavening/Proofing is important.
• Fermentace a kynutí jsou důležité. = Fermentation and leavening/proofing are important.

Why is the adjective důležité and not důležitá or důležitý?

The adjective has to agree with the subject.

Here the subject is a combination of:

• fermentace — feminine singular
• kynutí — neuter singular

Together, they form a plural subject. With this kind of mixed non-masculine-animate subject, Czech uses the plural form důležité.

So the sentence is:

• Fermentace a kynutí jsou důležité.

If you describe just one noun, the form changes:

• Fermentace je důležitá. — feminine singular
• Kynutí je důležité. — neuter singular

What case are fermentace and kynutí in?