Ĉiu modelo kontribuas al la albumo.

Ĉiu means each/every and is grammatically singular, so it goes with the singular noun modelo.

• ĉiu modelo = each model / every model
• ĉiuj modeloj = all the models

So this sentence emphasizes the models one by one, not just the group as a whole.

Kontribuas comes from the verb kontribui, meaning to contribute.

The ending -as marks the present tense in Esperanto:

• kontribuas = contributes / contribute
• kontribuis = contributed
• kontribuos = will contribute

Esperanto verbs do not change according to the subject. So:

• mi kontribuas
• vi kontribuas
• li kontribuas
• ili kontribuas

all use the same present-tense ending -as.

The verb kontribui normally takes al when you say what something is contributed to.

So:

• kontribui al io = to contribute to something

In this sentence:

• kontribuas al la albumo = contributes to the album

This works much like English to contribute to.

La is the Esperanto definite article, meaning the.

So:

• albumo = an album / album
• la albumo = the album

The sentence is talking about a specific album, so la is used.

Albumon would be the accusative form, usually used for a direct object.

But here albumo comes after the preposition al:

• al la albumo

After a preposition like al, you normally do not use -n just because the noun is related to the verb. The preposition already shows the role.

So:

• Mi vidas la albumon. = I see the album.
  (direct object, so -n)
• Mi kontribuas al la albumo. = I contribute to the album.
  (preposition al, so no -n)

Modelo is a noun. In Esperanto, nouns usually end in -o.

So:

• modelo = model
• albumo = album

If you wanted the plural, you would add -j:

• modeloj = models
• albumoj = albums

No. Modelo is normally gender-neutral in Esperanto.

It can mean model in a general sense, regardless of sex, unless the context makes it clear. If someone specifically wants to mark female sex, they might use a feminine form such as modelino, but modelo by itself is neutral.

So ĉiu modelo means each model, not specifically each female model.

Ĉiu is pronounced roughly like CHEE-oo.

A few details:

• ĉ sounds like ch in chair
• iu is two vowel sounds together: ee-oo
• stress in Esperanto is always on the second-to-last syllable, so here the stress is on ĈI-:
  • ĈI-u

A rough English-friendly pronunciation is:

CHEE-oo mo-DE-lo kon-tri-BU-as al la al-BU-mo

A few notes:

• Stress is always on the penultimate syllable:
  • ĈI-u
  • mo-DE-lo
  • kon-tri-BU-as
  • al-BU-mo
• Every letter is pronounced clearly.
• Esperanto spelling is very regular, so pronunciation is much more predictable than in English.

Yes, Esperanto word order is fairly flexible, though Subject–Verb–Prepositional phrase is the most neutral here:

• Ĉiu modelo kontribuas al la albumo.

You could also say:

• Al la albumo kontribuas ĉiu modelo.

That might sound more literary or emphatic, focusing first on the album. But the original order is the most straightforward for learners.

It can often be translated as either each or every, depending on context.

So this sentence could mean:

• Each model contributes to the album.
• Every model contributes to the album.

In many cases, Esperanto ĉiu covers both ideas. If the context emphasizes individuals one by one, English each may sound better; if it emphasizes the whole set, every may sound better.

Yes, it could. The Esperanto sentence itself simply says that every model is contributing to the album. It does not specify:

• what each one contributes
• whether they all contribute equally
• whether they contribute the same kind of thing

Those details would need extra words if they mattered.

The sentence breaks down like this:

• Ĉiu modelo = subject = each model
• kontribuas = verb = contributes
• al la albumo = prepositional phrase = to the album

So the pattern is:

subject + verb + prepositional phrase

That is a very common and natural sentence pattern in Esperanto.