Drenajul este important.

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

• drenaj = drainage / a drainage system
• drenajul = the drainage / the drainage system

Here, -ul is the definite article used with many masculine and neuter singular nouns.

Drenaj is a neuter noun in Romanian.

That matters because Romanian neuter nouns behave:

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

So in this sentence, since the noun is singular, the adjective also appears in the masculine singular form: important.

Because drenajul is singular, and as a neuter singular noun it takes masculine singular agreement.

So:

• masculine singular: important
• feminine singular: importantă
• plural: importante

That is why Drenajul este important is correct.

For comparison:

• Casa este importantă = The house is important.
• Drenajele sunt importante = The drainage systems are important.

Este is the 3rd person singular present tense of a fi = to be.

So it means is.

In this sentence:

• drenajul = the drainage
• este = is
• important = important

Romanian normally uses este in this kind of sentence, just like English uses is.

Yes. In everyday Romanian, e is a very common short form of este.

So you may hear:

• Drenajul e important.

This means exactly the same thing.

• este sounds a bit more full or neutral
• e sounds more natural in casual speech

Both are correct.

A good approximation is:

dreh-NAH-zhul YES-teh im-por-TANT

A few useful details:

• j in Romanian sounds like the s in measure or the zh in vision
• este is usually pronounced YES-teh
• the stress is roughly on:
  • dreNAJul
  • ESte
  • imporTANT

So drenajul is not dre-na-jool with an English j sound; it is closer to dre-NAH-zhul.

The normal, neutral order is:

Drenajul este important.

That is the most straightforward way to say it.

Romanian word order is somewhat flexible, but changing it usually changes the emphasis. For example:

• Este important drenajul. can sound more marked, contrastive, or context-dependent.

For a learner, the safest pattern is:

subject + este/e + adjective

So this sentence is a very standard model.

You add nu before the verb:

Drenajul nu este important.
or, more casually:
Drenajul nu e important.

So:

• este = is
• nu este = is not

This is the regular Romanian way to make a sentence negative.

A simple way is to keep the same words and use question intonation in speech:

Drenajul este important?

You can also invert the order:

Este important drenajul?

Both can work, but the second one often sounds more clearly like a question in writing.

It is a real and correct Romanian word, but it sounds somewhat technical or specialized, depending on context.

You might see it in areas like:

• construction
• engineering
• agriculture
• medicine

So the sentence is perfectly natural, especially in technical or practical discussion, even if it is not the most everyday topic.