Ŝi ludos, eĉ se la kostumo ne estos preta.

Eĉ se means even if.

• se = if
• eĉ = even

So eĉ se la kostumo ne estos preta means even if the costume will not be ready.

It introduces a condition that does not stop the main action:

• Ŝi ludos = She will perform / play
• eĉ se... = even if...

So the idea is: the performance will happen regardless.

Because ludi is the verb to play / perform, and -os is the Esperanto future ending.

• ludi = to play
• ludas = plays / is playing
• ludis = played
• ludos = will play

So Ŝi ludos means She will play / perform.

That is a very common question. Esperanto usually keeps the tense logically consistent with the time being discussed.

Since the situation is in the future, Esperanto naturally uses the future tense in both clauses:

• Ŝi ludos = she will perform
• la kostumo ne estos preta = the costume will not be ready

In English, after if, when, even if, we often use the present tense to talk about the future:

• Even if the costume isn’t ready

Esperanto does not need to follow that English pattern. Using estos here is normal and clear.

Because preta is an adjective describing la kostumo, which is singular and not taking the accusative.

• kostumo = singular noun
• preta = singular adjective matching it

In Esperanto, adjectives agree with the noun in number and case:

• singular: preta
• plural: pretaj
• accusative singular: pretan
• accusative plural: pretajn

Here, la kostumo is the subject of estos, so there is no -n:

• la kostumo ne estos preta

Also, after esti (to be), the adjective is normally a predicate adjective, not a direct object.

Because it is the subject of the verb estos.

In la kostumo ne estos preta:

• la kostumo = the subject
• estos = will be
• preta = ready

The accusative -n is mainly used for direct objects, not subjects.

Compare:

• La kostumo estos preta. = The costume will be ready.
  
  • la kostumo is the subject, so no -n
• Ŝi portos la kostumon. = She will wear the costume.
  
  • la kostumon is the direct object, so it takes -n

Preta means ready.

It is an adjective, so it changes form if needed:

• preta = ready
• pretaj = ready (plural)
• pretan = ready (accusative singular)
• pretajn = ready (accusative plural)

In this sentence, ne estos preta means will not be ready.

Ne comes before the part it negates. Here it negates estos preta:

• la kostumo ne estos preta = the costume will not be ready

That is the normal placement.

You can think of it as:

• ne estos = will not be

Esperanto usually puts ne directly before the verb phrase or the element being denied.

Often yes, but context matters.

Kostumo can mean:

• a theatrical costume
• a costume for a performance
• sometimes a suit or formal outfit, depending on context

In this sentence, because of Ŝi ludos and the idea of something not being ready, many learners will naturally understand kostumo as a performance or stage costume.

Yes, Esperanto word order is fairly flexible, though the original order is the most neutral.

Neutral:

• Ŝi ludos, eĉ se la kostumo ne estos preta.

You could also say:

• Eĉ se la kostumo ne estos preta, ŝi ludos.

That version emphasizes the condition first:

• Even if the costume won’t be ready, she will perform.

Because Esperanto marks grammar clearly with endings, word order can move around more freely than in English. Still, learners should usually start with the most straightforward order.

Ŝ is pronounced like English sh.

So:

• ŝi sounds like shee

This word means she.

A few other letters in the sentence may also stand out:

• eĉ: ĉ sounds like English ch
• ĉ in eĉ makes it sound roughly like etch
• estos has a plain s sound, never a z sound unless spelling indicates it

Esperanto spelling is very regular: one letter has one basic sound.

It depends on context. Ludi can mean several related things:

• to play a game
• to play an instrument
• to act / perform a role

In a sentence with the costume, many learners will understand Ŝi ludos as something like:

• She will perform
• She will act
• She will go on anyway

So the exact English translation depends on the broader situation, but the Esperanto verb itself is normal.