La butiko anstataŭigos la difektitan produkton.

In Esperanto, -os is the future tense ending.

So:

• anstataŭigas = replaces / is replacing
• anstataŭigis = replaced
• anstataŭigos = will replace

That tells you the action happens in the future.

The -n marks the direct object in Esperanto.

In this sentence:

• La butiko = the store → the thing doing the action
• la difektitan produkton = the damaged product → the thing being replaced

So produkton gets -n because it is the object of the verb.

This is called the accusative ending.

Because adjectives in Esperanto must agree with the nouns they describe.

Here:

• produkto = product
• difektita produkto = damaged product

Since produkton is in the accusative, the adjective must match it:

• difektita produkto = a damaged product
• difektitan produkton = a damaged product as a direct object

So the adjective gets -n too.

There are two things happening here:

1. -a makes an adjective
2. -n is added because the noun phrase is the direct object

So:

• difekta would mean damaged or defective as a plain adjective form
• difektita specifically means having been damaged / damaged
• difektitan is that same adjective, but with the accusative -n to agree with produkton

So la difektitan produkton is one complete object phrase, and both words show that.

It can be broken down like this:

• anstataŭ = instead of / in place of
• -ig- = make, cause to become
• -os = future tense

So anstataŭigi means to replace, literally something like to cause something to be in place of something else.

Then anstataŭigos means will replace.

La is the Esperanto definite article, like English the.

So:

• La butiko = the store
• la difektitan produkton = the damaged product

Esperanto has only one definite article: la.
It does not change for gender, number, or case.

That makes it simpler than in many other languages.

The main clue is the -n ending.

• La butiko has no -n, so it is the subject
• la difektitan produkton has -n on the noun and matching adjective, so it is the object

Even if the word order changed, the -n would still show what is being acted on.

For example, Esperanto could also say:

La difektitan produkton la butiko anstataŭigos.

That still means The store will replace the damaged product, because produkton is marked as the object.

Yes. Esperanto word order is fairly flexible because the -n ending helps show grammatical roles.

The most neutral order here is:

La butiko anstataŭigos la difektitan produkton.

But other orders are possible for emphasis, such as:

La difektitan produkton la butiko anstataŭigos.

That might emphasize the damaged product.

Even so, learners should usually start with the basic subject–verb–object order, since it is the clearest and most common.

Yes. Difektita is based on a participle.

From the verb difekti = to damage, spoil, impair

• difektita = damaged, having been damaged

This is a very common Esperanto pattern:

• fermi = to close → fermita = closed
• rompi = to break → rompita = broken
• difekti = to damage → difektita = damaged

So la difektitan produkton literally means the product that has been damaged, though in natural English we usually just say the damaged product.

A rough pronunciation guide is:

La butiko an-sta-TAŬ-EE-gos la di-fek-TEE-tan pro-DUK-ton

A few useful notes:

• a sounds like a in father
• i sounds like ee
• o sounds like o in for (pure, not diphthongized)
• u sounds like oo
• ŭ is a short w-like sound, as in Eŭropo

Stress in Esperanto is always on the second-to-last syllable:

• bu-TI-ko
• an-sta-ŬI-gos? Wait carefully: in anstataŭigos, the stress is on the second-to-last syllable: an-sta-ta-ŭi-GOS? Actually syllabification is an-sta-taŭ-i-gos, so the stress is on i? More simply for learners: anstataŭIgos.
• di-fek-TI-tan
• pro-DUK-ton

So the verb is stressed near the end: anstataŭIgos.

Usually, in a sentence like this, anstataŭigos is the safer and more standard choice for will replace.

Why?

• anstataŭ by itself means instead of / in place of
• anstataŭigi clearly means to replace

So La butiko anstataŭigos la difektitan produkton clearly means The store will replace the damaged product.

For a learner, it is best to remember anstataŭigi = replace.

The dictionary forms are:

• la = the
• butiko = store, shop
• anstataŭigi = to replace
• difekti = to damage
• difektita = damaged
• produkto = product

In Esperanto, verbs are usually listed in the -i form:

• anstataŭigi → to replace

Nouns are listed in -o form:

• butiko
• produkto

Adjectives are listed in -a form:

• difektita as an adjective meaning damaged

That makes it easier to recognize how sentence forms are built.