El paquet danyat és un perill.

Because paquet is a masculine singular noun in Catalan, so it takes the masculine singular definite article el.

• el = the for masculine singular nouns
• la = the for feminine singular nouns

So:

• el paquet = the package
• not la paquet

Grammatical gender in Catalan does not always match natural gender, so it is something you usually have to learn with each noun.

Danyat means damaged.

Here it is an adjective describing paquet:

• paquet = package
• danyat = damaged

So el paquet danyat means the damaged package.

It comes from the verb danyar, meaning to damage. Like in English, a form originally related to a verb can also function as an adjective.

In Catalan, adjectives often come after the noun, much more often than in English.

So:

• el paquet danyat = literally the package damaged
• natural English: the damaged package

This noun + adjective order is very normal in Catalan. English speakers often want to put the adjective first, but in Catalan paquet danyat is the expected order.

Because danyat has to agree with paquet, and paquet is masculine singular.

Catalan adjectives usually agree in gender and number with the noun they describe.

Here are the basic patterns:

• masculine singular: danyat
• feminine singular: danyada
• masculine plural: danyats
• feminine plural: danyades

So:

• el paquet danyat = the damaged package
• la capsa danyada = the damaged box
• els paquets danyats = the damaged packages

És means is. It is the third-person singular form of ser.

So:

• El paquet danyat és un perill = The damaged package is a danger

The accent is important because és and es are different words in Catalan.

• és = is
• es = a pronoun used in reflexive and pronominal constructions

So the accent helps distinguish meanings.

It uses és because the sentence is identifying the damaged package as a danger / a hazard.

Catalan often uses ser in this kind of statement, just like English uses to be:

• Això és un problema = This is a problem
• El paquet danyat és un perill = The damaged package is a danger

You could also say something like El paquet danyat és perillós meaning The damaged package is dangerous, but that is a slightly different structure:

• és un perill = is a danger / is a hazard
• és perillós = is dangerous

Because perill is being used as a countable noun here: a danger or a hazard.

So Catalan uses the indefinite article:

• un perill = a danger

Without the article, perill would not sound natural in this sentence.

Compare:

• és un perill = it is a danger
• hi ha perill = there is danger

The second example is a more general, uncountable idea of danger. In your sentence, the package is being classified as a danger, so un is needed.

Because perill is a masculine noun.

So the correct indefinite article is:

• un perill = a danger

If the noun were feminine, you would use una.

Yes, depending on context, that may be the most natural English translation.

Literally, the sentence means:

• The damaged package is a danger

But in natural English, you might often say:

• The damaged package is dangerous
• The damaged package is a hazard

So the Catalan sentence uses a noun phrase, while English may prefer an adjective or a different noun phrase depending on style.

A rough pronunciation is pah-KET or puh-KET, depending on accent.

A few helpful points:

• the stress is on the second syllable: pa-QUET
• the final t is pronounced
• qu here sounds like a hard k

So paquet is not pronounced like English packet, even though they are related in meaning.

Yes. It follows a very normal Catalan pattern:

• El paquet danyat = subject
• és = verb
• un perill = predicate noun

So the structure is:

Subject + verb + complement

This is completely standard and natural Catalan.

Yes, but that means something different.

• El paquet està danyat = The package is damaged
• El paquet danyat és un perill = The damaged package is a danger

In the first sentence, danyat is the main description after the verb. In the original sentence, danyat is part of the subject phrase el paquet danyat.

So both are correct, but they express different ideas.