Auto je zřejmě levné.

Because it agrees with auto, which is neuter singular.

In Czech, adjectives change their endings to match the noun’s:

• levný = masculine
• levná = feminine
• levné = neuter

So:

• levný dům = a cheap house
• levná kniha = a cheap book
• levné auto = a cheap car

In Auto je zřejmě levné, the adjective is still matching auto, even though it comes after je.

Auto is treated as a neuter noun in Czech. That is the normal gender for this word.

A useful pattern is that many Czech nouns ending in -o are neuter, and auto follows that pattern.

So you get:

• to auto = the car / this car
• to levné auto = the cheap car

Even though car is not neuter in English, grammatical gender in Czech does not have to match English logic.

Zřejmě usually means something like:

• apparently
• evidently
• seemingly

So Auto je zřejmě levné means the speaker is not stating it as a hard fact only, but as something that appears to be true.

Compared with asi:

• asi = probably
• zřejmě = apparently / evidently, often based on some sign or impression

So zřejmě often suggests: from what I can tell, it seems cheap.

Here, je is necessary.

• je = is
• It is the 3rd person singular form of být = to be

In Czech, when you say that something is something or is a certain way, you normally use the verb:

• Auto je levné. = The car is cheap.

You cannot normally say just Auto levné in standard Czech.

So the structure is:

• Auto = subject
• je = is
• levné = adjective describing the subject

Yes, Czech word order is fairly flexible, and zřejmě can move.

Possible versions include:

• Auto je zřejmě levné.
• Auto je levné zřejmě. (less natural in many contexts)
• Zřejmě je auto levné.
• Auto zřejmě je levné. (possible, but less common as a neutral sentence)

The most neutral version here is:

• Auto je zřejmě levné.

Putting zřejmě before levné works well because it modifies the whole statement smoothly: the car is apparently cheap.

So the sentence order is natural, but not the only possible one.

It can mean either, depending on context.

Czech has no articles like a or the, so auto by itself can be:

• a car
• the car

Context tells you which is meant.

So Auto je zřejmě levné could mean:

• The car is apparently cheap.
• A car is apparently cheap.

In real use, the situation usually makes it clear.

Yes. Auto is the subject, so it is in the nominative.

In this sentence:

• Auto = subject
• je = verb
• levné = predicate adjective

So the basic structure is: Subject + to be + adjective.

Also, for auto, the nominative singular form is auto.

No. Levné is an adjective, not an adverb.

It describes auto, even though it comes after je.

Compare:

• levné auto = a cheap car
• Auto je levné. = The car is cheap.

An adverb would describe how something is done, but here we are describing what the car is like.

So levné means cheap, not cheaply.

A rough guide is: ZHRZHEY-mnye — but the hardest part is ř, which has no exact English equivalent.

A few notes:

• Czech stress is normally on the first syllable.
• So the stress is on zřej-.
• ě often affects the consonant before it.
• ř is a special Czech sound, something like a mix of r and zh.

If pronouncing ř is difficult, that is completely normal for English speakers. It takes practice.

Yes.

• Auto je levné. = The car is cheap.
• Auto je zřejmě levné. = The car is apparently cheap.

The version without zřejmě is a direct statement. The version with zřejmě sounds more cautious or observational.

So zřejmě adds the idea of appearance / inference.

The dictionary form is levný.

Czech dictionaries usually list adjectives in the masculine singular nominative form, so you would look up:

• levný = cheap

From that you get the other forms:

• levný = masculine
• levná = feminine
• levné = neuter

So even though the sentence uses levné, the headword you learn is levný.

Yes. The adjective must match the noun’s gender and number.

For example:

• Dům je zřejmě levný. = The house is apparently cheap.
  (dům = masculine)

• Kniha je zřejmě levná. = The book is apparently cheap.
  (kniha = feminine)

• Auto je zřejmě levné. = The car is apparently cheap.
  (auto = neuter)

So the ending changes because Czech agreement is very important.

Yes, it is natural and correct.

It sounds like something a speaker might say when judging the price based on some evidence, for example:

• looking at the advertisement
• noticing the condition of the car
• comparing it with other cars

So it has a natural meaning like: From what I can tell, the car seems cheap.