Ni kontrolas la takson kaj la skizon.

Ni means we.

In Esperanto, verbs do not change according to person or number. So:

• mi kontrolas = I check / am checking
• vi kontrolas = you check / are checking
• ni kontrolas = we check / are checking
• ili kontrolas = they check / are checking

The ending -as stays the same for all subjects in the present tense.

Because kontrolas is the present-tense finite verb.

• kontroli = to check
• kontrolas = check / am checking / are checking

Esperanto verb endings are very regular:

• -i = infinitive, like to check
• -as = present tense
• -is = past tense
• -os = future tense
• -us = conditional
• -u = command / jussive

So Ni kontrolas... means We check / We are checking...

They both take -n because they are direct objects of the verb kontrolas.

In this sentence, the things being checked are:

• la takson
• la skizon

Esperanto marks direct objects with the accusative ending -n. So:

• takso → takson
• skizo → skizon

English usually shows this by word order, but Esperanto often marks it directly with -n.

The basic forms are:

• takso
• skizo

Esperanto nouns normally end in -o. When a noun is a direct object, you add -n:

• takso → takson
• skizo → skizon

So if you look these words up, you would look for takso and skizo, not the -n forms.

La is the definite article, meaning the.

So:

• la takson = the assessment / the estimate as the object
• la skizon = the sketch / the draft as the object

Its presence tells you these are specific things, not just any assessment or any sketch.

If la were omitted, the meaning would be more indefinite or general, depending on context.

Because la is invariable in Esperanto.

It always stays la. It does not change for:

• singular or plural
• subject or object
• gender

So you get:

• la takso
• la takson
• la skizo
• la skizon

The noun changes, but la does not.

Yes, one la can often cover both nouns, but repeating it is also very normal.

So both of these are possible in many contexts:

• Ni kontrolas la takson kaj la skizon.
• Ni kontrolas la takson kaj skizon. or Ni kontrolas la takson kaj la skizon.

However, repeating la makes it especially clear that both nouns are definite and can sound more balanced or careful.

In the given sentence, repeating la is completely natural.

Kaj means and.

It connects the two objects:

• la takson
• la skizon

Both of them belong to the same verb kontrolas. In other words, we are checking both things.

Because both nouns are direct objects, both take -n.

The most normal order is:

• Ni kontrolas la takson kaj la skizon.

That is subject + verb + object, just like standard English.

But Esperanto word order is somewhat more flexible than English because the -n ending helps show what the object is. So other orders can be possible for emphasis or style.

Still, for a learner, the given order is the safest and most natural default.

Yes. In Esperanto, adjectives agree with the nouns they describe in number and case.

So if you said:

• la novan skizon = the new sketch
• la precizan takson = the precise assessment

the adjective also gets -n because the noun is a direct object.

That is an important pattern:

• skizo → skizon
• nova skizo → novan skizon