Lucrul este în mașină.

Because Romanian usually puts the definite article at the end of the noun, not in front of it.

• lucru = thing, work, matter
• lucrul = the thing, the work, the matter

So lucrul is the definite form.

Not always. lucru is a broad word. Depending on context, it can mean:

• thing
• work
• matter
• fact

So lucrul este în mașină could sound different depending on the situation, even though the intended meaning here is already known to you.

Este means is. It is the 3rd person singular form of a fi, which means to be.

So:

• eu sunt = I am
• tu ești = you are
• el/ea este = he/she/it is

In everyday Romanian, este is often shortened to e:

• Lucrul e în mașină.

That is very common and natural in speech.

Lucru is a neuter noun.

Romanian neuter nouns behave:

• like masculine in the singular
• like feminine in the plural

So you get:

• un lucru = a thing
• două lucruri = two things

This is normal for Romanian neuter nouns.

În means in.

It is spelled with î because Romanian spelling normally uses:

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

So:

• în
• înger
• but român, cuvânt

This is a spelling rule, not a change in meaning.

Mașină is the basic singular form of the noun, while mașina means the car or the machine more explicitly.

So:

• în mașină = in a car / in a machine, or sometimes in the car if the context already makes it clear
• în mașina = more clearly in the car / in the machine

English and Romanian do not always use definiteness in exactly the same way, so context matters a lot here.

Mașină can mean more than one thing, depending on context:

• car
• machine
• sometimes vehicle or device, depending on the situation

So this noun is broader than English car alone.

The main special letters here are:

• ș in mașină: like sh in ship
• ă in mașină: like the weak vowel at the end of sofa
• î in în: a sound English does not really have; try a short, central vowel with your lips relaxed

A rough pronunciation guide:

• lucrul ≈ LOO-krool
• este ≈ ES-te
• în ≈ a short central vowel + n
• mașină ≈ ma-SHI-nuh

That is only approximate, but it helps as a starting point.

Yes, but Lucrul este în mașină is the most neutral order.

It follows a very common pattern:

subject + verb + location

You can change the order for emphasis, for example:

• În mașină este lucrul.

That is grammatical, but it sounds more marked or emphatic, as if you are stressing where it is.

Sometimes, yes. Romanian often drops subject pronouns when the meaning is clear.

But in this sentence, lucrul is not just a pronoun like it; it is the full noun the thing, so keeping it is natural.

If the context already made the subject obvious, you could say:

• Este în mașină. = It is in the car.

That works when everyone already knows what it refers to.