És possible avui.

És is the third-person singular present form of ser, meaning is.

The accent is important: és with an accent means is, while es without an accent is a different word, often a reflexive or object pronoun, like himself / herself / itself in some contexts.

So in this sentence, és is simply the verb is.

Catalan often leaves out subjects that English requires.

In English, you say It is possible today, using a dummy subject, it. In Catalan, that kind of empty subject is usually not expressed, so És possible avui is perfectly normal.

You can think of it as:

• English: It is possible today
• Catalan: Is possible today

Even though that sounds incomplete in English, it is natural in Catalan.

In Catalan, possible is normally used with ser: és possible.

That is because possible expresses a condition or judgment, not a temporary physical state or location. So:

• és possible = it is possible

Using estar here would not be standard.

Possible is an adjective. It describes something as being possible.

It is also a helpful cognate for English speakers because it looks very similar to possible in English and has the same basic meaning.

In this sentence, it works predicatively after the verb:

• és possible = is possible

Yes, but only partly.

• Singular: possible
• Plural: possibles

For masculine singular and feminine singular, the form is the same: possible.

So you could have:

• És possible = singular
• Són possibles = plural

In És possible avui, it is singular.

Yes, avui can move around.

In the given sentence, avui comes at the end:

• És possible avui

But Catalan often allows flexible word order, especially with time expressions. You could also say:

• Avui és possible

Both are grammatical. The difference is mainly one of emphasis or style. Putting avui first highlights today more strongly.

Avui is an adverb meaning today.

It does not need an article or preposition here. It simply tells you when something is possible.

So:

• avui = today

It works much like an adverb of time in English.

It can be a complete sentence, especially in context.

Catalan often allows short, context-dependent sentences. For example, if someone asks whether something can be done on a certain day, the answer És possible avui is perfectly natural.

Out of context, a fuller sentence might be more common, such as:

• És possible fer-ho avui = It is possible to do it today
• Això és possible avui = That is possible today

So the short version is fine, but it often relies on context.

You can make it a question with intonation in speech, and with question marks in writing:

• És possible avui?

The word order does not need to change.

Catalan often forms yes/no questions simply by using questioning intonation, unlike English, which usually changes word order to Is it possible today?

You add no before the verb:

• No és possible avui = It is not possible today

This is the normal way to negate the sentence in Catalan:

• no + verb

So:

• És possible avui = affirmative
• No és possible avui = negative