Totožnost a podpis jsou důležité.

Because together they make a compound subject: totožnost a podpis = identity and signature.

In Czech, just like in English, two singular nouns joined by a (and) normally take a plural verb:

• Podpis je důležitý. = The signature is important.
• Totožnost a podpis jsou důležité. = Identity and signature are important.

So jsou is plural because the sentence is talking about two things.

Because the adjective has to agree with the subject.

Here the subject is totožnost a podpis, which is plural overall, so the adjective must also be plural.

The two nouns have different genders:

• totožnost = feminine
• podpis = masculine inanimate

With this kind of mixed plural subject, Czech uses the plural adjective form důležité.

So:

• důležitý = singular masculine
• důležitá = singular feminine
• důležití = plural masculine animate
• důležité = the correct form here

A useful shortcut: if the subject is plural and does not include a masculine animate noun, -é is often what you will see in this kind of predicate adjective.

• totožnost is feminine
• podpis is masculine inanimate

Why?

• Nouns ending in -ost are very often feminine in Czech, so totožnost follows a very common pattern.
• podpis ends in a consonant and refers to a thing, not a person, so it is masculine inanimate.

This matters because gender affects adjective agreement and declension.

It is an adjective.

In this sentence, jsou důležité means are important. Czech uses an adjective after být (to be) just like English does:

• Podpis je důležitý. = The signature is important.
• Dokumenty jsou důležité. = The documents are important.

So důležité is not modifying the verb jsou. It is describing the subject.

They are in the nominative case because they are the subject of the sentence.

You can think of the structure as:

• Totožnost a podpis = subject
• jsou = verb
• důležité = predicate adjective

The adjective důležité is also in the nominative plural here, because it agrees with the subject in this copular sentence.

Because Czech normally does not use articles.

So where English says:

• the identity
• a signature
• the signature

Czech often just uses the noun by itself:

• totožnost
• podpis

Whether the meaning is definite or indefinite is usually understood from context.

That is why Totožnost a podpis jsou důležité is a complete, natural sentence with no articles.

Because Czech, like English, often uses the singular when talking about a concept in general.

Here, totožnost and podpis are being treated as general categories or requirements, not as a countable set of many identities and many signatures.

Compare English:

• Identity and signature are important.
• not necessarily Identities and signatures are important.

So the singular in Czech is perfectly natural here.

Yes, you could say Důležité jsou totožnost a podpis.

The original sentence:

• Totožnost a podpis jsou důležité.

is the most neutral order: subject + verb + complement.

But Czech word order is flexible, and moving důležité to the front gives it more emphasis:

• Důležité jsou totožnost a podpis.
  = What is important is identity and signature.

So both are grammatical, but the emphasis changes.

In normal standard Czech, no.

You usually keep the present tense of být (to be):

• Totožnost a podpis jsou důležité.

Leaving out jsou would sound incomplete in ordinary standard prose or speech.

You may sometimes see omission in headlines, notes, or very compressed styles, but for a learner, the safe rule is:

Keep the verb.

In this sentence, a is the normal word for and.

• totožnost a podpis = identity and signature

The word i can sometimes be translated as and, but it often has the sense of also, too, or even, depending on context.

So for a simple coordination of two nouns, a is the standard choice.

They overlap, but they are not always identical.

• totožnost often means identity in an official, legal, or factual sense: who someone is
• identita can be broader and may refer to personal, social, cultural, or psychological identity

In a sentence like this one, especially in an administrative or formal context, totožnost sounds very natural.

So if the sentence is about documents, verification, or formal requirements, totožnost is probably the better choice.

A few helpful points:

• Czech stress is usually on the first syllable of each word:
  • TOtožnost
  • A
  • PODpis
  • JSOU
  • DŮležité

Useful sound notes:

• ž sounds like the s in measure
• ů sounds like a long oo
• é is a long e
• ou in jsou is a diphthong, roughly like oh + oo said smoothly together

So a rough English-friendly guide would be:

TO-tozh-nost a POD-pis zhoh-oo dOO-le-zhi-teh

Not perfect, but close enough to help you get started.