Eu também suspiro quando o meu irmão ronca no quarto ao lado.

You can omit eu in Portuguese, because the verb form suspiro already shows the subject is I.

So both are possible:

• Eu também suspiro...
• Também suspiro...

Including eu can add a little emphasis or clarity. In European Portuguese, leaving subject pronouns out is very common when the verb ending already makes the subject clear.

In European Portuguese, it is very common and standard to use the definite article before a possessive:

• o meu irmão = my brother
• a minha irmã = my sister
• o meu quarto = my room

In Brazilian Portuguese, people often say meu irmão without the article.

So for Portugal, o meu irmão sounds very natural.

Também means also or too.

In Eu também suspiro..., it means I also sigh or I sigh too.

Its position is flexible, but different placements can sound slightly different in emphasis:

• Eu também suspiro... = neutral, very natural
• Também suspiro... = also natural
• Eu suspiro também = more like I sigh too / as well

So the sentence uses a very normal word order.

Yes, here suspiro is a verb.

It comes from the verb suspirar = to sigh.

Conjugation in the present tense:

• eu suspiro = I sigh
• tu suspiras = you sigh
• ele/ela suspira = he/she sighs

You are right that suspiro can also be a noun in other contexts, meaning a sigh. Context tells you which one it is. In this sentence, because it follows eu, it is clearly the verb: I sigh.

Ronca comes from roncar, which means to snore.

Here it is the third person singular present:

• eu ronco = I snore
• tu roncas = you snore
• ele/ela ronca = he/she snores

So o meu irmão ronca means my brother snores.

Because this sentence describes a habitual or repeated situation:

• Eu também suspiro quando o meu irmão ronca no quarto ao lado.
• I also sigh when my brother snores in the next room.

This means whenever that happens, not one specific future event.

In Portuguese, quando can be followed by different tenses depending on the meaning:

• Habit / general truth: quando + present indicative
  • Quando ele ronca, eu suspiro.
• Future event: often quando + future subjunctive
  • Quando ele roncar, eu vou suspirar.
  • When he snores / when he does snore, I will sigh.

So the tense here is correct for a general repeated action.

No is a contraction of:

• em = in
• o = the

So:

• em + o = no

That means:

• no quarto = in the room / in the bedroom

This kind of contraction is extremely common in Portuguese:

• na = em + a
• nos = em + os
• nas = em + as

O quarto ao lado means the room next door or the room next to it.

The expression ao lado literally means at the side or next to.

So:

• no quarto ao lado = in the room next door

This is a very common expression. You can also use ao lado with people or objects:

• Ela está ao meu lado. = She is next to me.
• A farmácia é ao lado do banco. = The pharmacy is next to the bank.

Here, quarto most naturally means bedroom.

In Portuguese, quarto often means bedroom, although in some contexts it can be understood more generally as room. In this sentence, since someone is snoring there, bedroom is the most natural interpretation.

Also, watch out: quarto can also mean fourth in other contexts:

• o quarto dia = the fourth day

But in your sentence, it is clearly the noun room/bedroom.

Yes, these are tricky for English speakers because both words contain nasal vowels.

• irmão has -ão, a very common Portuguese nasal ending.
• também has a nasal sound at the end as well.

A rough guide:

• irmão sounds something like eer-MOW̃
• também sounds roughly like tam-BÃỸ

But the important thing is that the vowel is nasalised, meaning some air also passes through the nose.

In European Portuguese, these vowels are often less open and less fully pronounced than an English speaker expects, especially in fast speech. It is best to listen to native audio and imitate the rhythm rather than rely only on spelling.

Yes. Portuguese allows some flexibility in word order.

You could also say:

• Quando o meu irmão ronca no quarto ao lado, eu também suspiro.

This means the same thing. Starting with quando puts the time/situation first, while the original starts with eu, so it focuses first on I.

Both are natural.

Yes, it is natural and grammatically correct in European Portuguese.

A Portuguese speaker would understand it immediately as something like a habitual reaction:

• I also sigh when my brother snores in the next room.

A small nuance: suspiro suggests a sigh, often from tiredness, annoyance, resignation, or emotional reaction. So the sentence sounds like the speaker is bothered or exasperated by the snoring, which fits the context well.