Krátké podání není dlouhé podání.

Here podání most naturally means serve in a sports context.

But podání is a broad word in Czech and can also mean things like:

• submission
• filing
• application
• delivery / performance in some contexts

So the exact English translation depends on the situation. In this sentence, if the meaning shown to the learner is a sports one, then short serve and long serve is the right way to understand it.

Because they have to agree with podání.

In Czech, adjectives change to match the noun in:

• gender
• number
• case

Podání is a neuter singular noun here, so the adjectives must also be neuter singular nominative:

• krátký = dictionary form
• krátké = neuter singular
• dlouhý = dictionary form
• dlouhé = neuter singular

So:

• krátké podání
• dlouhé podání

both have matching adjective endings.

Není means is not.

It is the negative form of je (is), from the verb být (to be):

• je = is
• není = is not

Czech normally makes this kind of verb negation by adding ne- directly to the verb form.

Also, není is 3rd person singular, which matches the singular subject krátké podání.

Because in this kind of sentence, Czech often keeps both parts in the nominative:

• X není Y = X is not Y

So both noun phrases are in the same basic form:

• krátké podání
• dlouhé podání

This is very natural when you are saying that one thing is or is not another thing.

The clearest clue is the verb není, which is singular.

If the subject were plural, the verb would be nejsou.

That matters because podání is one of those Czech nouns whose singular and plural can look very similar. Compare:

• Krátké podání není dlouhé podání. = singular
• Krátká podání nejsou dlouhá podání. = plural

Notice that in the plural:

• the noun podání still looks the same
• but the adjectives change to krátká / dlouhá
• and the verb changes to nejsou

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

So Krátké podání není dlouhé podání could be understood as:

• A short serve is not a long serve
• The short serve is not the long serve

Which one sounds best in English depends on context. Czech leaves that unstated.

Yes, Czech word order is fairly flexible.

This sentence has a neutral, straightforward order:

• Krátké podání = subject/topic
• není = verb
• dlouhé podání = complement

You could reverse the two noun phrases:

• Dlouhé podání není krátké podání.

That would still be grammatical, but it changes the emphasis. Czech often uses word order to highlight what is already known and what is being contrasted or stressed.

The accents here mostly show vowel length, not stress.

So:

• á = long a
• é = long e
• í = long i

Examples from the sentence:

• Krátké
• podání
• není
• dlouhé

A very important point: Czech word stress is usually on the first syllable of the word, even if another syllable has a long vowel.

So you pronounce the stress like this:

• KRÁT-ké
• PO-dá-ní
• NE-ní
• DLOU-hé

Also, ou in dlouhé is a real diphthong.

Not exactly.

In Czech, n before i or í is usually pronounced as a soft n sound, similar to the ny sound in canyon.

So není is roughly pronounced like:

• nye-nee

More precisely, both n sounds are soft:

• ne → soft n
• ní → soft n

The same softening happens in podání at the end:

• -ní sounds like -nyi

This is very common in Czech spelling and pronunciation.

It is just a normal adjective + noun combination.

• krátké = short
• podání = serve / submission / filing, depending on context

So you can make many similar phrases the same way:

• dlouhé podání = long serve
• rychlé podání = fast serve / quick submission
• dobré podání = good serve / good submission

The grammar pattern is very productive.