La progreso de la studentoj estas klara, ĉar ili praktikas ĉiun tagon.

Yes. De is the usual Esperanto word for of, and it often shows possession, connection, or relationship.

So:

• la progreso de la studentoj = the progress of the students

This is a very normal structure in Esperanto. English sometimes uses two patterns:

• the students' progress
• the progress of the students

Esperanto usually uses the de pattern here.

Because -o marks a noun, and -j marks the plural.

So:

• studento = student
• studentoj = students

This is one of the most regular parts of Esperanto grammar:

• noun = -o
• plural = add -j

Because the sentence is talking about the progress as one general thing, not separate individual progresses.

So la progreso de la studentoj means something like:

• the students' progress as a whole
• the overall progress of the students

If you wanted to talk about separate individual kinds of progress, you could use progresoj, but that would be less natural in this sentence.

La is the definite article, meaning the.

So:

• la progreso = the progress
• la studentoj = the students

Esperanto has only one article, la. It does not have a separate word for a or an.

In this sentence, la studentoj suggests we are talking about a specific group of students, not students in general.

Because klara is an adjective, and here it describes the noun progreso.

• klara = clear
• klare = clearly

In the sentence:

• La progreso ... estas klara = The progress ... is clear

That is the same pattern as:

• La ĉambro estas granda = The room is big
• La vetero estas bona = The weather is good

If you used klare, it would be an adverb, and that would not fit this structure.

Both are possible.

• estas klara = is clear
• klaras = is clear

Esperanto often allows either:

• a form with esti
  • adjective
• or a direct verb form made from the same root

So both of these are natural:

• La progreso de la studentoj estas klara
• La progreso de la studentoj klaras

The version with estas klara may feel a little more explicit or beginner-friendly.

It matches progreso, not studentoj.

The subject of the sentence is:

• La progreso de la studentoj

The main noun there is progreso, which is singular. The phrase de la studentoj just tells whose progress it is.

So the adjective must also be singular:

• progreso → klara

If the subject were plural, the adjective would also be plural:

• La progresoj estas klaraj = The progresses / signs of progress are clear

Ĉar means because. It introduces the reason.

So the sentence structure is:

• La progreso de la studentoj estas klara = statement
• ĉar ili praktikas ĉiun tagon = reason

Together:

• The progress of the students is clear, because they practice every day

This is a very common conjunction in Esperanto.

Here ili refers to la studentoj.

So:

• la studentoj = the students
• ili = they

This avoids repeating the noun.

Also, ili is just the normal plural pronoun they. It does not show gender.

In Esperanto, the present tense -as can cover both ideas, depending on context.

So praktikas can mean:

• practice
• are practicing

In this sentence, because of ĉiun tagon = every day, the meaning is clearly habitual:

• they practice every day

Esperanto does not have a special mandatory progressive form like English are practicing.

Good question. This is because ĉiun tagon is an accusative time expression, meaning every day.

First, tagon gets -n because Esperanto often uses the accusative to show duration or time expressions without a preposition.

Second, ĉiun must agree with tagon, so it also gets -n.

Breakdown:

• ĉiu tago = every day, each day
• ĉiun tagon = every day, used adverbially in the sentence

Agreement is very regular in Esperanto:

• singular noun: tago
• accusative singular noun: tagon
• matching adjective/determiner: ĉiun

Yes, absolutely.

• ĉiun tagon = every day
• ĉiutage = daily / every day

So you could also say:

• La progreso de la studentoj estas klara, ĉar ili praktikas ĉiutage.

Both are correct and natural.
Ĉiun tagon is a noun phrase with an accusative ending.
Ĉiutage is an adverb.

Esperanto word order is fairly flexible, but this sentence uses the most neutral, standard order.

Normal order here is:

• La progreso de la studentoj estas klara, ĉar ili praktikas ĉiun tagon.

Because Esperanto marks grammar with endings, some rearrangement is possible. But for learners, this standard order is the safest and clearest choice.

For example, the main clause and the ĉar clause could be reversed:

• Ĉar ili praktikas ĉiun tagon, la progreso de la studentoj estas klara.

That still means the same thing.

The letter ĉ is pronounced like ch in church.

So:

• ĉar sounds roughly like char
• ĉiun begins with that same ch sound

A few more helpful points:

• j in Esperanto sounds like English y
• ĉiu sounds roughly like CHEE-oo
• ĉiun is CHEE-oon with the final -n

So:

• ĉar ili praktikas ĉiun tagon

has a pronunciation roughly like:

• char EE-lee prak-TEE-kas CHEE-oon TAH-gon

That is only an approximation, but it is helpful for an English speaker.