Parbrizul este curat.

Because -ul is the definite article in Romanian, attached to the end of the noun.

• parbriz = a windshield / windshield
• parbrizul = the windshield

Unlike English, Romanian usually puts the at the end of the noun instead of using a separate word.

Parbriz is a neuter noun in Romanian.

Romanian neuter nouns are a bit special:

• in the singular, they behave like masculine
• in the plural, they behave like feminine

So in this sentence, because it is singular, it uses forms that look masculine.

Because parbrizul is singular, and as a neuter singular noun it takes the masculine singular adjective form.

So:

• curat = masculine/neuter singular
• curată = feminine singular
• curate = feminine/neuter plural

That is why Parbrizul este curat is correct.

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

So:

• Parbrizul este curat = The windshield is clean

In normal standard Romanian, you usually do not leave it out here. Romanian needs the verb, just like English does in this kind of sentence.

Yes. E is a very common short form of este.

So both are correct:

• Parbrizul este curat = a bit more formal or neutral
• Parbrizul e curat = very common in everyday speech

This is the normal Romanian order for a simple statement:

subject + verb + adjective

• Parbrizul = subject
• este = verb
• curat = adjective describing the subject

It works very much like English The windshield is clean.

Not always.

When an adjective is used directly with a noun, it often comes after it:

• parbriz curat = clean windshield
• parbrizul curat = the clean windshield

But in your sentence, curat is not directly attached to the noun. It comes after este and acts as a predicate adjective:

• Parbrizul este curat = The windshield is clean

So here it comes after the verb, not directly after the noun.

A simple English-friendly approximation is:

par-BREE-zul ES-teh koo-RAHT

A few tips:

• z sounds like the z in zoo
• r is trilled or tapped, not the English r
• u is like oo in food, but shorter
• c in curat sounds like k

The stress is roughly on:

• parbrizul
• este
• curat

Yes. Since parbriz is neuter, the plural changes both the noun and the adjective:

• parbrize = windshields
• parbrizele = the windshields
• curate = clean for feminine/neuter plural

So:

• Parbrizele sunt curate. = The windshields are clean.

Notice:

• este becomes sunt = are
• curat becomes curate

Yes, absolutely. It is a complete, natural, standard Romanian sentence.

It sounds like a normal factual statement, the same way The windshield is clean does in English. It could be used in everyday conversation, for example when talking about a car.

Yes, but that changes the emphasis.

• Parbrizul este curat = neutral, normal statement
• Curat este parbrizul = marked or poetic/emphatic, as if stressing clean

For beginners, the normal order Parbrizul este curat is the best one to use.

The indefinite version is:

Un parbriz este curat.

That means A windshield is clean or One windshield is clean, depending on context.

Compare:

• parbriz = windshield
• un parbriz = a windshield
• parbrizul = the windshield

So the main difference is whether the noun is indefinite or definite.