Gràcies per avisar.

After gràcies per in Catalan, you normally use the infinitive of the verb.

• Gràcies per avisar = Thanks for letting me know / warning me
• avisar is the infinitive: to inform / to warn / to let someone know

So this structure is very similar to English thanks for + -ing, but Catalan uses per + infinitive instead of a gerund.

Other examples:

• Gràcies per venir = Thanks for coming
• Gràcies per ajudar = Thanks for helping

Avisar can mean several related things, depending on context:

• to let someone know
• to inform
• to warn
• to notify

In Gràcies per avisar, it often means something natural like:

• Thanks for letting me know
• Thanks for telling me
• Thanks for warning me

So the exact English translation depends on the situation, even though the Catalan verb stays the same.

Good question. Gràcies per avisar is often used in a general way, where the object is understood from context.

If you want to make it explicit, you can say:

• Gràcies per avisar-me = Thanks for letting me know / warning me

Both are possible:

• Gràcies per avisar → natural when it is obvious who was informed
• Gràcies per avisar-me → more explicit

Catalan often leaves out things that are clear from context.

It is neutral and works in both formal and informal situations.

You can use it with:

• a friend
• a coworker
• a stranger
• a teacher
• customer service

If you want to sound warmer or stronger, you can say:

• Moltes gràcies per avisar = Thanks a lot for letting me know
• Gràcies per avisar-me = slightly more explicit/personal

So the basic sentence is very useful and widely acceptable.

A simple learner-friendly pronunciation is:

• GRA-see-es per ah-vee-ZAR

A few useful notes:

• Gràcies has the stress on the first syllable: GRÀ-cies
• In avisar, the stress is on the last syllable: avi-SAR
• The s in avisar sounds like a z sound in many varieties because it is between vowels

So it may sound roughly like:

• GRA-see-es per ah-vee-ZAR
• or more closely in some accents: GRA-si-es per uh-vi-ZAR

The accent mark in gràcies shows where the stress goes:

• gràcies → stress on grà

Without getting too technical, it helps signal the correct pronunciation. So you say:

• GRÀ-cies

not

• gra-CI-es

Accent marks in Catalan are very important because they often tell you which syllable is stressed.

Yes, absolutely. That is very common.

• Gràcies per avisar = Thanks for letting me know
• Moltes gràcies per avisar = Thank you very much / Thanks a lot for letting me know

Adding moltes just makes it stronger or warmer.

Yes. Gràcies per haver avisat is also correct, but it is a bit more explicit about the action being completed.

Compare:

• Gràcies per avisar = the most common, natural everyday version
• Gràcies per haver avisat = Thanks for having informed me / Thanks for informing me, with a clearer completed-action feel

In many everyday situations, people simply say Gràcies per avisar.

You use per when you are thanking someone for doing something.

• Gràcies per avisar
• Gràcies per venir
• Gràcies per ajudar-me

But if you are just saying thanks on its own, then there is no per:

• Gràcies! = Thanks!

So:

• gràcies + per + infinitive = thanks for doing something

Yes. That depends on context.

Because avisar can mean both to inform and to warn, the sentence could fit situations like:

• someone tells you about a schedule change
• someone warns you a place is closed
• someone lets you know about a problem in advance

So Gràcies per avisar is flexible and can match several natural English translations.