La aĉetanto kontrolas la staton de la tekruĉo.

The -n ending marks the direct object in Esperanto.

In this sentence, the thing being checked is the condition/state, so la stato becomes la staton.

• kontrolas = checks
• la staton = the condition/state

A very common learner question is why tekruĉo does not get -n too. That is because tekruĉo is inside a de phrase: de la tekruĉo = of the teapot. The direct object is the whole noun phrase la staton de la tekruĉo.

Because de means of, and after a preposition like de, nouns normally do not take the accusative -n.

So:

• la staton = the object being checked
• de la tekruĉo = of the teapot, telling us whose condition it is

Esperanto often uses de where English uses of or an apostrophe:

• la kovrilo de la poto = the lid of the pot
• la koloro de la muro = the color of the wall

Yes. aĉetanto is made from:

• aĉet- = buy
• -ant- = active present participle, meaning someone who is doing the action
• -o = noun ending

So aĉetanto literally means a buying person, or more naturally, buyer.

This is a very typical Esperanto word-building pattern:

• lernanto = learner
• parolanto = speaker
• skribanto = writer / one who is writing

The ending -as marks the present tense in Esperanto.

So kontrolas means checks / is checking.

Esperanto verb endings are very regular:

• -as = present
• -is = past
• -os = future
• -us = conditional
• -u = command / jussive
• -i = infinitive

Examples:

• kontrolas = checks
• kontrolis = checked
• kontrolos = will check

Because Esperanto uses la for each noun that is definite.

Here both nouns are definite:

• la aĉetanto = the buyer
• la tekruĉo = the teapot

So Esperanto does not usually skip the article just because another noun already has it. Each noun phrase gets its own la if it is definite.

Also, la staton is definite too, so this sentence actually has la three times:

• La aĉetanto
• la staton
• la tekruĉo

No. aĉetanto is gender-neutral.

By default, Esperanto job and person words like this do not specify sex unless something else makes it clear.

If you want to specify, you can do so separately, for example with:

• vira aĉetanto = male buyer
• ina aĉetanto = female buyer

But the plain form aĉetanto just means buyer.

Yes, the word order could be changed more freely than in English, because Esperanto uses endings like -n to show grammatical roles.

The normal, neutral order is:

• La aĉetanto kontrolas la staton de la tekruĉo.

Because staton has -n, we know it is the object.

You could rearrange parts for emphasis, although some versions sound less neutral:

• La staton de la tekruĉo kontrolas la aĉetanto.

That is still understandable, but the original sentence is the most straightforward and natural for ordinary use.

Both can relate to condition, but they are not always identical.

• stato often means state, status, or condition in a broad sense
• kondiĉo often means condition in the sense of quality, physical condition, or sometimes a term/requirement

In many contexts they overlap, but la staton de la tekruĉo sounds like checking what state the teapot is in.
If the focus were specifically on wear, damage, or quality, some speakers might also choose kondiĉon, depending on context.

So stato is not wrong at all; it is just one reasonable choice.

The special letter here is ĉ.

• ĉ is pronounced like ch in church

So:

• aĉetanto has ĉ like ch
• tekruĉo also has ĉ like ch

A few helpful reminders:

• Each Esperanto letter has one regular sound
• Stress usually falls on the second-to-last syllable

So roughly:

• a-che-TAN-to
• te-KRU-cho

Yes. tekruĉo is a compound word:

• te- = tea
• kruĉo = jug, pitcher, pot-like container

So tekruĉo is literally a tea-jug/pot, which is why it means teapot.

Compound building is extremely common in Esperanto. Usually the last part is the main thing, and the earlier part modifies it.

For example:

• te-taso = teacup
• akvo-botelo = water bottle
• kuir-poto = cooking pot

Esperanto normally uses de instead of an apostrophe construction.

So English:

• the teapot’s condition

becomes Esperanto:

• la stato de la tekruĉo

This is one of the most common ways Esperanto expresses possession or relationship between nouns.

There are other ways to express related ideas in Esperanto, but de is the basic and most direct one here.

Yes. Esperanto -as does not force the same distinction that English does between checks and is checking.

So kontrolas can often be translated as:

• checks
• is checking
• sometimes even does check, depending on context

The exact English translation depends on the situation, not just the Esperanto verb ending.

Because all the nouns here are singular.

In Esperanto, plural nouns take -j:

• aĉetanto = buyer
• aĉetantoj = buyers
• tekruĉo = teapot
• tekruĉoj = teapots

This sentence talks about one buyer and one teapot, so there is no -j.

If the direct object were plural, you would often see both -j and -n together:

• la statojn = the states/conditions