Poznal jsem bývalého ředitele.

Because Czech past tense is normally built from:

• a past participle: poznal
• plus an auxiliary from být: jsem

So:

• poznal jsem = I met / I recognized
• literally something like recognized am, but in Czech that is just the normal past-tense structure

The -l in poznal is part of the masculine singular past form.

Czech often leaves out the subject pronoun when it is clear from the verb.

Here, jsem already tells you the subject is I, so já is unnecessary.

That is why Poznal jsem bývalého ředitele. is a natural neutral sentence.

You could say:

• Já jsem poznal bývalého ředitele.

but that would usually add emphasis, such as:

• I was the one who met him
• or contrast with someone else

Also, Czech word order is more flexible than English. Poznal jsem... is very common.

Because they are in the accusative case.

The verb poznat takes a direct object, and the direct object here is the former director.

Base forms:

• bývalý ředitel = former director nominative
• bývalého ředitele = accusative

Since ředitel refers to a person, it is masculine animate, and masculine animate nouns usually have a special accusative form.

The adjective has to match the noun, so both words change:

• bývalý → bývalého
• ředitel → ředitele

In Czech grammar, animate does not mean currently alive and moving in a real-world sense. It is a grammatical category.

Nouns referring to male people are usually masculine animate.

So ředitel is animate because it means director / headmaster / manager, a person.

That matters especially in the accusative:

• masculine animate often changes form
• masculine inanimate often stays the same as nominative

Compare:

• Vidím ředitele. = I see the director.
• Vidím stůl. = I see the table.

Bývalý means former in the sense of someone who used to hold that role, but does not anymore.

So:

• bývalý ředitel = former director

It is very common for jobs, positions, and relationships.

Examples:

• bývalý prezident = former president
• bývalý učitel = former teacher
• bývalý manžel = ex-husband / former husband

It comes from the verb bývat, related to to be / used to be.

Yes. Poznat is a very useful verb with a few related meanings, such as:

• to meet / get to know
• to recognize
• to come to know / find out by experience

The exact meaning depends on context.

So Poznal jsem bývalého ředitele. could, depending on context, suggest:

• I met the former director
• I got to know the former director
• sometimes even I recognized the former director

This is one reason learners often ask about poznat. It is broader than one single English verb.

Because poznat and znát are related but not the same.

• poznat is usually perfective
• znát is usually imperfective

Very roughly:

• poznat = to get to know / to recognize / to come to know
• znát = to know, be familiar with

So:

• Poznal jsem ho. = I met him / I got to know him / I recognized him.
• Znal jsem ho. = I knew him.

This is an important aspect pair in Czech.

Yes, poznat is generally a perfective verb.

Perfective verbs present an action as a whole or as completed. In this sentence, it suggests a completed event:

• I met / recognized the former director as a finished occurrence

Its imperfective partner is often poznávat in some contexts, while znát is also related semantically but not just a simple ongoing version of the same sentence.

For a beginner, the main practical point is:

• poznal jsem sounds like a completed event in the past
• not an ongoing state like I knew

Because Czech has no articles like English a/an/the.

Whether something is a director or the director is understood from context.

So:

• ředitel can mean a director or the director
• bývalého ředitele can mean a former director or the former director

In actual use, context tells you which one is meant.

The sound ř is one of the most famous difficult Czech sounds.

It is a special Czech sound, something like a rolled/trilled r combined with a zh-like quality. There is no exact English equivalent.

For ředitele, learners often start by approximating it rather than trying to make it perfect immediately.

A rough breakdown:

• ře sounds somewhat like rzhe said quickly, but that is only an approximation
• di in ředitele is softer than English di
• stress in Czech is usually on the first syllable, so: ŘE-di-te-le

Do not worry if your ř is imperfect at first. Even many advanced learners take time to master it.

Czech has a group of short unstressed words called clitics, and jsem is one of them.

These words often appear in the second position of the clause, not necessarily as the second word in the English sense, but in a very early slot in the sentence.

So in:

• Poznal jsem bývalého ředitele.

jsem naturally comes right after the first element Poznal.

That is why this order sounds very normal.

You will see the same with other clitics too.

Yes. That is grammatically correct.

Czech word order is flexible, and changing the order changes the focus or emphasis, not usually the basic meaning.

Compare:

• Poznal jsem bývalého ředitele.
  Neutral, straightforward.

• Bývalého ředitele jsem poznal.
  Puts more focus on the former director.

You might use that if you are contrasting him with someone else, or if the former director is already the topic.

Yes. Ředitel is one of the masculine animate nouns that form the accusative singular like this:

• nominative: ředitel
• accusative: ředitele

This pattern is very common for masculine animate nouns ending in -el or similar consonant endings.

For learners, the important thing is to remember the whole pattern:

• ten bývalý ředitel
• vidím toho bývalého ředitele

That makes it easier to internalize both the noun and adjective endings together.

Usually no.

Poznal jsem is already fully clear as I met / I recognized.

You add já only when you want extra emphasis, contrast, or clarity in a special situation.

For example:

• Já jsem poznal bývalého ředitele, ale Petr ne.
  I met the former director, but Petr did not.

Without that special reason, leaving out já is the normal Czech style.

The past participle would change.

A woman would say:

• Poznala jsem bývalého ředitele.

So:

• male speaker: Poznal jsem...
• female speaker: Poznala jsem...

This is because Czech past-tense forms agree with the subject’s gender in the singular.