Nevím, jestli má auto automatickou převodovku, nebo manuální převodovku.

Czech often leaves out subject pronouns when the verb ending already shows who the subject is.
Nevím already means I don’t know, so já is unnecessary.

You could say Já nevím, but that usually adds emphasis, like I don’t know.

Because vědět means to know a fact / to know information, while znát means to know a person, place, or thing by familiarity.

So:

• Nevím = I don’t know
• Neznám to auto = I don’t know that car / I’m not familiar with that car

Here the speaker does not know a piece of information, so nevím is correct.

Here jestli means whether or if in an indirect yes/no question.

So Nevím, jestli... means I don’t know whether...

A more formal alternative is zda:

• Nevím, jestli má auto...
• Nevím, zda má auto...

Both are correct. Jestli is very common in everyday Czech.

Jestli má auto... is the neutral, natural word order here.

Czech word order is more flexible than English, but it is not random. In this sentence:

• má auto = neutral, straightforward
• auto má = possible, but it sounds more contrastive or emphatic

For example, jestli auto má could suggest something like whether the car does have one in contrast to some other possibility.

So the given order is the most natural plain statement.

Czech has no articles. There is no direct equivalent of English a and the in normal sentences.

So auto can mean:

• a car
• the car

The exact meaning depends on context, not on an article.

Auto is neuter in Czech.

That matters for agreement in some situations, especially with adjectives, pronouns, and past-tense forms.

In this sentence, the main visible effect is simply that auto is the singular subject, so the verb is singular: má = has.

Because auto is the subject, and automatickou převodovku is the direct object.

The verb mít means to have, so Czech structures this idea just like English:

• auto má převodovku = the car has a transmission

Since převodovka is the direct object, it goes into the accusative case.

Because it is a feminine singular noun in the accusative case.

Dictionary form:

• převodovka = nominative singular

In this sentence, after má, it becomes:

• převodovku = accusative singular

This is a very common pattern for feminine nouns ending in -a.

Because these two adjectives belong to different declension types.

• automatický / automatická / automatické is a hard adjective
• manuální is a soft adjective

Both agree with převodovku in gender, number, and case, but they show that agreement differently.

So in accusative feminine singular:

• automatická → automatickou
• manuální → manuální
  (same form here)

So even though they modify the same noun, their endings do not have to look the same.

Yes, it often can.

For example:

• Nevím, jestli má auto automatickou, nebo manuální převodovku.

That is also natural and avoids repetition.

The version with převodovku repeated is very clear and perfectly correct. Repeating the noun can sound a bit more explicit or careful.

Usually, no. In a sentence like this, many native speakers would write:

• Nevím, jestli má auto automatickou převodovku nebo manuální převodovku.

The comma before jestli is normal, because it introduces a subordinate clause.

But before nebo, if it is just connecting two alternatives inside the same clause, Czech usually does not need a comma.

So the comma before nebo in the given sentence is not the most standard choice.

Because nebo means or and introduces two alternatives:

• automatickou převodovku
• manuální převodovku

Other words are possible:

• anebo = also or, often slightly more emphatic
• či = or, but more formal or literary

In everyday Czech, nebo is the most normal choice.

Yes. A common shorter version would be:

• Nevím, jestli má auto automatickou, nebo manuální převodovku.

Or without the comma before nebo:

• Nevím, jestli má auto automatickou nebo manuální převodovku.

These sound a bit more streamlined. The original sentence is still understandable and correct in grammar; it is just more repetitive.

Yes. Manuální převodovka is the standard term.

You may also hear more conversational ways of referring to manual vs. automatic, depending on context, but automatická převodovka and manuální převodovka are clear, standard Czech expressions.