Mi miksas la kartaron antaŭ ol ni komencas.

Because kartaron is the direct object of miksas.

In Esperanto, the thing directly affected by the verb usually takes the accusative ending -n. Here, the action is being done to the deck, so:

• Mi miksas la kartaro → incorrect
• Mi miksas la kartaron → correct

A quick breakdown:

• mi = I
• miksas = mix / shuffle
• la kartaron = the deck of cards, as the direct object

Kartaro means a set or collection of cards, so in this context it means a deck of cards.

It is built like this:

• karto = a card
• -ar- = a collection or group of things
• kartaro = a collection of cards

This suffix is very common in Esperanto. For example:

• arbo = tree
• arbaro = forest

So kartaro is not just cards in general; it means the cards considered as one whole set.

Because kartaro emphasizes the whole deck as a single set, while kartoj just means cards.

Compare:

• Mi miksas la kartaron. = I shuffle the deck.
• Mi miksas la kartojn. = I shuffle the cards.

Both can make sense, but kartaro is especially natural when you mean the full deck as one game object.

For a native English speaker, this is similar to the difference between the cards and the deck.

La is the definite article, meaning the.

It is used because the sentence refers to a specific deck, not just any deck. In a card-game situation, both speaker and listener usually know which deck is meant.

So:

• la kartaron = the deck
• kartaron = a deck

Also remember that la never changes form in Esperanto. Even though kartaron has -n, la stays la, not anything else.

Literally, miksi means to mix. But with cards, mixing the deck naturally means shuffling it.

So in card contexts, miksi la kartaron is a normal way to express shuffle the deck.

Depending on style or speaker, you may also encounter other ways to say it, but this sentence is perfectly understandable and natural.

Antaŭ ol means before when it introduces a whole clause.

Here is the structure:

• antaŭ = before
• ol = than / used in certain comparisons and clause linkings

Together, antaŭ ol means before in the sense of before something happens.

So:

• antaŭ ol ni komencas = before we start

This is different from antaŭ used just as a preposition:

• antaŭ la domo = in front of the house / before the house

A useful pattern to remember is:

• antaŭ ol + clause
• antaŭ + noun phrase

For example:

• Antaŭ ol mi foriras, mi manĝas. = Before I leave, I eat.
• Antaŭ la manĝo, mi lavas la manojn. = Before the meal, I wash my hands.

This is a very natural question.

Ni komencas is present tense, but in sentences about time, Esperanto often uses the present tense in a way that English also does:

• before we start
• not usually before we will start

So antaŭ ol ni komencas is normal.

Also, the whole sentence may describe a usual procedure:

• I shuffle the deck before we start

That sounds like a regular rule or routine, not necessarily one single future event.

If you want to make the future meaning more explicit, komencos is also possible in some contexts:

• Mi miksos la kartaron antaŭ ol ni komencos.

That would more clearly mean I will shuffle the deck before we start.

So the present tense here is not strange; it fits both general routine and time-clause usage.

In Esperanto, verb endings show tense, but not person.

For example, komencas can mean:

• I start
• you start
• he starts
• she starts
• we start
• they start

Because of that, the subject pronoun is usually needed:

• mi komencas = I start
• ni komencas = we start

So unlike Spanish or Italian, Esperanto normally does not drop subject pronouns.

Yes. Esperanto word order is fairly flexible, because endings show grammatical roles.

The basic order here is:

• Mi miksas la kartaron antaŭ ol ni komencas.

But you could also say:

• Antaŭ ol ni komencas, mi miksas la kartaron.

This puts more focus on the time relationship: Before we start, I shuffle the deck.

Because kartaron has the accusative -n, it is still clear that it is the object, even if you move things around.

That said, the original order is very natural and straightforward.

It can mean either, depending on context.

Mi miksas la kartaron antaŭ ol ni komencas can describe:

1. a habitual action

   • something the speaker normally does before a game starts

2. a present or near-immediate action

   • the speaker is shuffling now, before the group begins

Esperanto present tense is quite flexible, much like English present tense in many everyday sentences.

If you want to make the future very explicit, you can use future tense:

• Mi miksos la kartaron antaŭ ol ni komencos.

If you want to describe a repeated habit more clearly, context usually does the job, but you could also add something like ĉiam:

• Mi ĉiam miksas la kartaron antaŭ ol ni komencas. = I always shuffle the deck before we start.