Cada vez que alguém começa a buzinar sem motivo, a minha irmã fica logo irritada.

Cada vez que means every time that or whenever.

It introduces something that happens repeatedly:

• Cada vez que alguém começa a buzinar... = Every time someone starts honking...

It is very commonly followed by a verb in the indicative, especially when talking about real, repeated situations.

You could often replace it with sempre que:

• Cada vez que alguém começa a buzinar...
• Sempre que alguém começa a buzinar...

Both are natural, though cada vez que can feel a bit more like on each occasion that.

Alguém means someone / somebody.

It is used when the person is unknown or unspecified:

• alguém começa a buzinar = someone starts honking

This is a very common word in Portuguese. A few useful contrasts:

• alguém = someone
• ninguém = nobody
• alguma pessoa = some person, but this is less natural in everyday speech here

So alguém is the normal choice.

Because in Portuguese, começar is normally followed by a + infinitive in European Portuguese.

So:

• começar a buzinar = to start honking
• começar a falar = to start speaking
• começar a chover = to start raining

For an English speaker, this is worth remembering as a fixed pattern:

• começar a + infinitive

In Brazilian Portuguese, you may also hear começar a very often, so this pattern is widely useful.

Buzinar means to honk the horn.

It is specifically used for the sound made by a vehicle horn. So in this sentence:

• começa a buzinar = starts honking

Related words:

• buzina = horn
• buzinar = to honk

It usually suggests car traffic, impatience, noise, or annoyance.

Sem motivo means for no reason or without a reason.

So:

• buzinar sem motivo = to honk for no reason

Yes, sem razão is also possible and has a very similar meaning. In many contexts, both work:

• sem motivo
• sem razão

Sem motivo feels very natural here.

In European Portuguese, it is very common to use the definite article before possessives:

• a minha irmã = my sister
• o meu irmão = my brother
• a minha mãe = my mother

This is one of the features that often stands out to English speakers.

So in Portugal, a minha irmã sounds completely normal and expected.

If you say minha irmã without the article, it may sound less natural in standard European Portuguese, although learners will still be understood.

Ficar here means to become.

So:

• fica irritada = becomes irritated / gets irritated

This is important:

• ser irritada would suggest a more permanent characteristic and sounds odd here
• estar irritada means to be irritated, describing the state, not the change into that state
• ficar irritada means she gets irritated

So the sentence focuses on the reaction:

• Someone starts honking for no reason
• Then my sister gets irritated

This is a very common structure:

• ficar triste = to become sad
• ficar zangado = to get angry
• ficar cansado = to get tired

Here logo means right away, immediately, or very quickly.

So:

• fica logo irritada = gets irritated straight away

This is a very useful European Portuguese word. It often adds the idea that something happens quickly or without delay.

Be careful: it does not mean the English noun logo.

Examples:

• Vou logo tratar disso. = I’ll deal with that right away.
• Ela percebeu logo. = She understood immediately.

Because logo naturally comes before the adjective here to modify the whole result:

• fica logo irritada = gets irritated right away

Portuguese adverbs are quite flexible, but some positions sound more natural than others. In this sentence, fica logo irritada is smooth and idiomatic.

You might also hear:

• fica irritada logo

But that can sound less natural in this exact context, depending on emphasis.

So for learners, fica logo irritada is the safest version to copy.

Because the sentence describes a habitual or repeated situation.

Portuguese, like English, often uses the present tense for things that happen regularly:

• Cada vez que alguém começa a buzinar sem motivo, a minha irmã fica logo irritada.
• Every time someone starts honking for no reason, my sister gets irritated right away.

This is not about one specific event. It is about a pattern.

The present tense is the normal tense for this kind of general truth or repeated reaction.

Yes. Sempre que is a very natural alternative.

Compare:

• Cada vez que alguém começa a buzinar sem motivo...
• Sempre que alguém começa a buzinar sem motivo...

Both mean whenever / every time someone starts honking for no reason.

Very roughly:

• cada vez que = every time that, each time that
• sempre que = whenever

In many everyday situations, they are interchangeable.

Yes, it sounds very natural in European Portuguese.

A few things that fit European Portuguese well are:

• a minha irmã: the article before the possessive is especially characteristic of Portugal
• logo: very common and frequent in European Portuguese
• começar a + infinitive: standard and natural
• buzinar: fully correct and common

A Brazilian speaker would also understand the sentence perfectly, but in Brazil you may more often hear slight variations in rhythm, article use, or vocabulary preference depending on region and style.

A careful learner version might be roughly:

CA-da vez k’ al-GUÉM co-ME-ça a bu-zi-NAR sem mo-TI-vu, a MI-nha ir-MÃ fi-ca LO-gu ir-ri-TA-da

A few points to notice:

• alguém has a nasal ending
• minha has the nh sound, like ny in canyon
• irmã ends with a nasal ã
• logo in European Portuguese is often pronounced with a more reduced final vowel than an English speaker expects

If you want to sound more natural, focus especially on:

• reduced unstressed vowels
• nasal vowels in alguém and irmã
• linking between words, such as vez que and alguém começa