Olarul arde ceramica în cuptor.

Because -ul is the definite article attached to the end of a masculine singular noun.

• olar = potter
• olarul = the potter

Romanian usually puts the at the end of the noun instead of using a separate word like English does.

For the same reason: ceramica is the definite form.

• ceramică = ceramic / pottery / ceramics
• ceramica = the ceramic / the pottery / the ceramics

With many feminine nouns ending in -ă, the definite singular form ends in -a:

• casă → casa
• ceramică → ceramica

So the final -a here is not random; it marks definiteness.

Grammatically, it is singular. But semantically, it can refer to pottery or ceramic ware as a collective/material noun.

That means Romanian uses a singular form where English may naturally say:

• the pottery
• the ceramic
• sometimes the ceramics

So even if the English translation sounds plural, the Romanian form here is still singular.

The basic verb a arde means to burn.

But in this context, with pottery and a kiln, it means to fire or to bake in a kiln. So Romanian uses the ordinary verb to burn, while English often uses the more specialized verb to fire for ceramics.

So:

• literal/basic meaning: burns
• natural meaning in this sentence: fires

Because ceramica is an inanimate direct object.

In Romanian, pe is commonly used before specific animate direct objects, especially people:

• Văd fata. = I see the girl.
• Îl văd pe profesor. = I see the teacher.

But with an inanimate noun like ceramica, you normally do not use pe:

• Olarul arde ceramica. = correct

So the lack of pe is completely normal here.

Cuptor without an article means oven/kiln in a more general or indefinite sense.

• în cuptor = in an oven / in the kiln (general context)
• în cuptorul = in the oven / in the kiln (a specific one)

Romanian often leaves a noun indefinite after a preposition when the location is being mentioned generally. If you wanted to stress a specific kiln, you could say în cuptorul...

Also remember that if the noun were definite, the article would still be attached to the noun:

• cuptor = oven/kiln
• cuptorul = the oven/kiln

În usually means in, into, inside.

In a sentence like this, it marks location:

• în cuptor = in the kiln

After most prepositions, Romanian nouns look like their normal form unless there is an article or adjective making the form clearer. So for a beginner, the main thing to notice is simply that în is the usual word for in/inside.

Yes. This is the basic, neutral order:

Subject + Verb + Object + Place

• Olarul = subject
• arde = verb
• ceramica = direct object
• în cuptor = place

So this sentence has a very standard Romanian structure.

Romanian word order can be changed for emphasis, but the version you have is the most neutral and natural one for a basic statement.

Because Romanian does not need a subject pronoun when it is already clear from the verb form or from the noun subject.

Here the subject is already stated:

• Olarul = the potter

So adding el would be unnecessary in a neutral sentence.

Romanian often drops subject pronouns unless they are needed for contrast or emphasis.

They are:

• olarul → olar = potter
• arde → a arde = to burn / to fire
• ceramica → ceramică = ceramic / pottery / ceramics
• în → în = in
• cuptor → cuptor = oven / kiln

For verbs, Romanian dictionaries usually list the infinitive with a, so you look up a arde, not just arde.

A rough English-friendly guide is:

o-LA-rul AR-de che-RA-mi-ka in kup-TOR

A few helpful notes:

• ce in ceramica sounds like che in check
• c before a in -ca sounds like k
• cuptor has k at the start: kup-TOR
• r in Romanian is usually trilled or tapped more than in English
• în contains a vowel that English does not really have

The stress is roughly:

• o-LA-rul
• AR-de
• ce-RA-mi-ca
• kup-TOR

In pronunciation, î and â represent the same sound in standard Romanian.

The difference is mostly a spelling rule:

• î is usually used at the beginning or end of a word
• â is usually used inside a word

So în is written with î because it is at the beginning of the word.

This sound is unusual for English speakers, so it often takes practice.

Yes, they do.

In standard Romanian, you should write:

• în, not in
• ceramică in the dictionary form, not ceramica if you mean the indefinite noun

Diacritics can change pronunciation and sometimes meaning. Native speakers may understand text without them in informal writing, but learners should try to use them correctly from the start.