La revisió veterinària és difícil.

La is the feminine singular definite article, meaning the.

It is used because revisió is a feminine singular noun. In Catalan, nouns often take the definite article in places where English might or might not use the.

• la revisió = the checkup / the examination

So La revisió veterinària is literally The veterinary checkup.

In Catalan, every noun has a grammatical gender, usually masculine or feminine. Revisió is a feminine noun, so it takes feminine words with it:

• la revisió
• revisió veterinària

This is grammatical gender, not biological gender. English speakers often have to simply learn the gender together with the noun.

A good habit is to memorize nouns with their article:

• la revisió
• el llibre
• la casa

Because in Catalan, descriptive adjectives usually come after the noun.

So:

• revisió veterinària = veterinary checkup

This is more natural in Catalan than putting the adjective first. English often puts adjectives before the noun, but Catalan usually places them after it.

Other examples:

• una casa gran = a big house
• un problema difícil = a difficult problem

Because adjectives must agree with the noun they describe in gender and number.

Since revisió is feminine singular, the adjective must also be feminine singular:

• masculine singular: veterinari
• feminine singular: veterinària
• masculine plural: veterinaris
• feminine plural: veterinàries

So:

• un control veterinari
• la revisió veterinària

És means is. It is the 3rd person singular form of the verb ser.

• és = is

The accent is important because it distinguishes és from es.

• és = is
• es = a reflexive/pronominal word, often like himself/herself/itself or part of a verb structure

So the accent is not optional here.

Catalan, like Spanish, often distinguishes between ser and estar.

Here, és difícil uses ser because difficult is describing the thing in a general or essential way. It means the veterinary checkup is difficult by nature or as a general fact.

• és difícil = it is difficult

In many beginner contexts, when you are describing what something is like in a general sense, ser is the normal choice.

Some Catalan adjectives have the same form for masculine and feminine singular. Difícil is one of them.

So you get:

• un examen difícil
• una revisió difícil

The singular form stays difícil for both genders.

Only the plural changes:

• exàmens difícils
• revisions difícils

A simple pronunciation guide is:

lah reh-vee-ZYOH veh-teh-ree-NAH-ree-uh ez dee-fee-SEEL

A few useful notes:

• revisió is stressed on the last syllable because of -ó
• veterinària is stressed on -nà-
• és is a short stressed word
• difícil is stressed on the first í

The written accents show where the stress goes, so they are very helpful for pronunciation.

Normally, no. In a standard sentence like this, you would usually keep the article:

• La revisió veterinària és difícil.

Leaving out la would sound unnatural in most ordinary contexts. Catalan often uses articles with nouns more consistently than English does.

The normal, neutral word order is:

La revisió veterinària + és + difícil

That is:

• subject
• verb
• adjective/complement

Catalan word order can sometimes change for emphasis, but this version is the standard and most natural one for learners to use.

The plural would be:

Les revisions veterinàries són difícils.

Here is what changes:

• La → Les
• revisió → revisions
• veterinària → veterinàries
• és → són
• difícil → difícils

So Catalan shows plural agreement in several parts of the sentence.