Ajutorul este necesar.

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

• ajutor = help
• ajutorul = the help

Romanian usually puts the definite article after the noun, unlike English, which puts the before it.

So:

• băiat = boy
• băiatul = the boy
• ajutor = help
• ajutorul = the help

Also, Romanian often uses the definite form with abstract nouns more often than English does, so ajutorul can sometimes sound natural where English would simply say help.

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

So in this sentence:

• Ajutorul = the help
• este = is
• necesar = necessary

Together: Ajutorul este necesar.

Normally, no. In a sentence like this, Romanian usually keeps the verb to be.

So:

• Ajutorul este necesar. = correct
• Ajutorul necesar. = not a normal complete sentence in standard Romanian

In everyday speech, though, people often shorten este to e:

• Ajutorul e necesar.

That is very common and natural in conversation.

Because ajutor is a neuter noun, and in the singular, neuter nouns use the same adjective form as masculine singular nouns.

So:

• masculine singular: necesar
• feminine singular: necesară

Since ajutorul is singular and neuter, the correct form is:

• Ajutorul este necesar.

If the noun were feminine, you would use necesară:

• Cartea este necesară. = The book is necessary.

Ajutor is neuter.

Romanian has three genders:

• masculine
• feminine
• neuter

Neuter nouns are special:

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

That is why:

• singular: ajutor necesar
• plural: ajutoare necesare

So in your sentence, the singular adjective form necesar is exactly what you expect.

Here, necesar is an adjective meaning necessary.

It describes the subject ajutorul, but it comes after the verb este, so it works like a predicate adjective:

• Ajutorul = subject
• este = linking verb
• necesar = adjective describing the subject

This is similar to English:

• The help is necessary.

The normal, neutral order here is:

• Ajutorul este necesar.

This is the most straightforward way to say it.

Romanian word order is somewhat flexible, so you may also see changes for emphasis, such as:

• Necesar este ajutorul.

But that sounds more marked or literary. For a learner, the best pattern to remember is:

subject + este/e + adjective

So this sentence is a very standard model.

A simple English-friendly approximation is:

ah-zhoo-TO-rul ES-teh neh-cheh-SAR

A few useful pronunciation notes:

• j in ajutorul sounds like the s in measure
• ce in necesar sounds like che in check
• the stress is roughly on:
  • ajuTOrul
  • ESte
  • neceSAR

So you can think of it as:

ah-zhoo-TO-rul ES-teh neh-cheh-SAR

Yes. That is very common in spoken Romanian.

• Ajutorul este necesar. = more full/neutral
• Ajutorul e necesar. = very natural in everyday speech

Both are correct. As a learner, it is good to recognize both forms.

Sometimes, but it does not mean exactly the same thing.

• Ajutorul este necesar. = the help is necessary / the help is needed
• Ajutor este necesar. = help is necessary / help is needed

The version without the definite article sounds more general or indefinite. The version with -ul sounds more specific, or it may reflect Romanian's tendency to use the definite form with abstract nouns.

So both can exist, but they are not always interchangeable.

The plural of ajutor is ajutoare, and because it is a neuter noun, the adjective changes to the feminine/plural form:

• Ajutoarele sunt necesare. = The helps / the forms of help are necessary

This is useful because it shows the neuter pattern clearly:

• singular: ajutorul este necesar
• plural: ajutoarele sunt necesare

Even if help is often uncountable in English, Romanian grammar still lets you see how the noun and adjective change.