Srdce je důležité.

A good rough pronunciation is SRR-tseh.

A few important points:

• The r is syllabic here, so it acts almost like a vowel. This is very common in Czech.
• The c is pronounced ts, like the end of cats.
• In normal pronunciation, the d before c is often heard more like t, so learners often hear something close to srtse.
• The stress is on the first syllable: SRD-ce.

If you want a rough IPA-style guide, it is approximately [sr̩t͡sɛ].

A rough pronunciation is DOO-leh-zhi-teh.

Notes:

• dů sounds like a long doo
• ž sounds like the s in measure
• é is a long e sound
• Czech stress normally falls on the first syllable, so: DŮ-le-ži-té

The accents matter:

• ů and é show that the vowels are long
• In modern Czech, ů and ú are pronounced the same way, as a long u

So yes, the accents are important and should not be ignored.

Because srdce is neuter singular, and Czech adjectives must agree with the noun they describe.

The basic dictionary form of the adjective is důležitý. Its endings change by gender:

• masculine: důležitý
• feminine: důležitá
• neuter: důležité

Since srdce is neuter, you get:

• Srdce je důležité.

Compare:

• Mozek je důležitý. — masculine
• Kniha je důležitá. — feminine
• Srdce je důležité. — neuter

Srdce is a neuter noun.

One clue is its ending: many Czech nouns ending in -e are neuter, though you should not rely on that rule 100% of the time. It is still a helpful pattern.

So when you learn srdce, it is best to learn it together with its gender:

• to srdce — the heart / that heart

That little word to is a useful hint that the noun is neuter.

Je is the 3rd person singular present form of the verb být, which means to be.

So:

• je = is

In this sentence, it links the subject and the description:

• Srdce = subject
• je = is
• důležité = important

Unlike in some other Slavic languages, standard Czech normally does use the present tense of to be, so je is completely normal and necessary here.

Here srdce is in the nominative case because it is the subject of the sentence.

In Srdce je důležité:

• srdce = nominative singular
• důležité = nominative singular neuter adjective used after je

This is a standard pattern in Czech:

• [subject in nominative] + být + [adjective agreeing with the subject]

So this is a very useful model sentence for beginners.

Because Czech does not have articles like English the and a/an.

So Srdce je důležité could mean:

• The heart is important
• A heart is important

In real life, context usually makes the meaning clear.

If Czech speakers want to be more specific, they may use words like to, ten, jedno, and so on, but there is no direct article system like English has.

Yes. Czech word order is more flexible than English word order.

The neutral, basic order is:

• Srdce je důležité.

But other orders are possible for emphasis or style, for example:

• Důležité je srdce.

That changes the focus and sounds more marked, something like What is important is the heart or The important thing is the heart, depending on context.

So the original sentence is the most natural all-purpose version.

Yes. It is still an adjective.

In this sentence, it is used as a predicate adjective: it describes the subject after the verb to be.

This is the same basic idea as in English:

• The heart is important.

Here important is describing the heart, and in Czech důležité does the same job.

So even though it is not directly in front of the noun, it is still an adjective and still has to agree with srdce.

Yes. It is a completely normal, correct, natural sentence.

It is also a very useful beginner sentence because it shows several important Czech patterns at once:

• a neuter noun: srdce
• the verb je
• adjective agreement: důležité
• standard subject–verb–complement word order

So it is short, simple, and very typical Czech.