Pacient čeká na lékaře.

Because na in the meaning to wait for requires the accusative case in Czech.

• dictionary form: lékař = doctor
• accusative singular: lékaře

So:

• Pacient čeká na lékaře. = The patient is waiting for the doctor.

This happens because čekat na + accusative is the normal pattern for wait for.

Yes, čekat means to wait, but if you say wait for someone/something, Czech normally uses:

• čekat na koho/co = to wait for someone/something

So:

• čekat = to wait
• čekat na lékaře = to wait for the doctor

Without na, the meaning would be incomplete or different in normal usage.

Čeká is the 3rd person singular present tense of čekat.

Conjugation:

• já čekám = I wait / am waiting
• ty čekáš = you wait / are waiting
• on/ona/ono čeká = he/she/it waits / is waiting

Since pacient is he grammatically (masculine singular), the verb is čeká.

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

So:

• pacient can mean a patient or the patient
• lékaře can mean a doctor or the doctor

The exact meaning depends on context. In this sentence, the intended meaning is understood from the situation, not from an article.

Yes. Pacient is the subject, and it is in the nominative case.

You can tell:

• Pacient = who is doing the action
• čeká = is waiting
• na lékaře = for the doctor

So the structure is:

• Pacient = subject
• čeká = verb
• na lékaře = prepositional phrase

Because they have different grammatical roles.

• Pacient is the subject, so it stays in the nominative: pacient
• lékař comes after na in the pattern čekat na + accusative, so it changes to lékaře

This is very common in Czech: nouns change form depending on their role in the sentence.

Here it is singular: for the doctor.

Why this can be confusing: for masculine animate nouns, the accusative singular often looks similar to the genitive singular, and some forms can also resemble plural forms in other patterns.

But in this sentence:

• lékař = nominative singular
• lékaře = accusative singular

Plural would be different in a full sentence, for example:

• Pacient čeká na lékaře can also theoretically be interpreted as doctors in some contexts, but normally context makes the intended meaning clear.
• More explicitly, Czech often avoids ambiguity through context or by changing surrounding words.

For a learner, the safest understanding here is: lékaře = singular accusative.

A helpful approximate pronunciation is:

• Pacient ≈ PA-tsi-ent
• čeká ≈ CHE-kaa
• na ≈ na
• lékaře ≈ LAY-ka-zhe

A few key points:

• č sounds like ch in church
• c sounds like ts
• ř is the famous Czech sound; many learners start with something between r and zh
• é and á are long vowels
• Czech stress is usually on the first syllable of each word:
  PA-cient ČE-ká NA LÉ-ka-ře

Yes, Czech word order is more flexible than English because case endings show grammatical roles.

The basic neutral order here is:

• Pacient čeká na lékaře.

But other orders are possible, for example:

• Na lékaře čeká pacient.
• Čeká pacient na lékaře.

These can shift emphasis or sound more marked depending on context.

Still, for learners, subject + verb + rest is the safest neutral pattern: Pacient čeká na lékaře.

It can mean both, depending on context.

Czech present tense often covers both:

• he waits
• he is waiting

So Pacient čeká na lékaře may be translated as:

• The patient waits for the doctor
• The patient is waiting for the doctor

In most everyday contexts, English would naturally use is waiting.

Yes, lékař is a standard and correct word for doctor/physician.

A very common everyday word is also:

• doktor

The difference is roughly:

• lékař = more formal/standard, often like physician
• doktor = common everyday doctor

Both are widely used, but lékař is completely natural here.

Both are masculine animate nouns.

That matters because masculine animate nouns often have special case endings, especially in the accusative.

For example:

• pacient → accusative singular: pacienta
• lékař → accusative singular: lékaře

In this sentence only lékař changes, because it is the noun governed by na after čekat na.

No, not in normal standard Czech for the meaning The patient is waiting for the doctor.

The usual and correct pattern is:

• čekat na někoho / něco = to wait for someone/something

So you should say:

• Pacient čeká na lékaře.

Using čekat without na would sound wrong or incomplete in this meaning.