Het pak is nieuw.

Because pak is a het-word in Dutch, meaning it takes the definite article het rather than de.

A few useful points:

• Dutch nouns are divided into de-words and het-words.
• Pak is one of the nouns that uses het: het pak
• You usually have to learn the article together with the noun.

So when learning vocabulary, it is best to memorize it as:

• het pak

not just pak by itself.

Here, het is the definite article, so it corresponds to the in English.

In other contexts, het can also mean it, but in this sentence it is clearly the article because it comes directly before the noun:

• het pak = the suit / the package depending on context

So in this sentence, het is not a pronoun; it is simply the.

This is the normal Dutch word order for a basic statement:

• subject
  • verb
    • rest

So here:

• Het pak = subject
• is = verb
• nieuw = adjective describing the subject

This works just like English:

• The suit is new.

Dutch main clauses usually place the conjugated verb in the second position, and that is exactly what happens here.

Because nieuw is being used after the verb is, not directly before the noun.

Compare:

• het nieuwe pak = the new suit
  
  • here the adjective comes before the noun, so it usually gets -e
• het pak is nieuw = the suit is new
  
  • here the adjective comes after is, so it normally has no -e

This is a very common Dutch pattern:

• de auto is snel
• het huis is groot
• de tafel is oud

So in this sentence, nieuw is correct because it is a predicative adjective.

Is is the third-person singular form of the verb zijn (to be).

The infinitive is:

• zijn = to be

Some present-tense forms are:

• ik ben = I am
• jij bent / ben jij = you are
• hij/zij/het is = he/she/it is

So in Het pak is nieuw, the subject het pak is singular, so Dutch uses is.

Yes. Pak can have several meanings depending on context. Common ones include:

• suit (clothing)
• package / pack
• sometimes other related meanings in expressions

So the exact meaning depends on the situation. Grammatically, though, the sentence works the same way no matter which meaning is intended.

A simple approximation for English speakers is something like neeuw, said quickly as one syllable.

A few pronunciation hints:

• ie sounds like the vowel in English see
• uw is harder, because Dutch ui/uw-like sounds do not match English exactly
• In everyday speech, many learners approximate nieuw somewhat like new, but with a clearer ee sound at the start

If you want a rough learner-friendly guide:

• nieuw ≈ nee-oo compressed into one syllable

It is best to listen to native audio, because this vowel combination is tricky.

Yes, it is grammatically correct, but it sounds repetitive.

It literally means:

• The new suit is new.

That is possible, but not very natural unless you are emphasizing something for a special reason.

This comparison helps show the difference between the two adjective positions:

• het nieuwe pak → adjective before the noun, so nieuwe
• het pak is nieuw → adjective after the verb, so nieuw

Yes. Dit pak is nieuw is also correct.

The difference is:

• Het pak is nieuw = The suit is new
• Dit pak is nieuw = This suit is new

So het identifies it as the suit, while dit points to this suit specifically.

The plural is:

• De pakken zijn nieuw.

Changes to notice:

• het pak → de pakken
• is → zijn
• nieuw stays nieuw

So:

• singular: Het pak is nieuw.
• plural: De pakken zijn nieuw.

This is another good example of how the adjective after the verb usually does not take -e.