O mecânico verifica a suspensão e o alinhamento.

O is the masculine singular definite article, meaning the.

So o mecânico means the mechanic, referring to a specific mechanic. If you said um mecânico, that would mean a mechanic.

In Portuguese, articles are used more often than in English, so o mecânico sounds natural here. Saying just mecânico verifica... would usually sound incomplete in a normal sentence.

Verifica is the third-person singular present indicative form of verificar.

That means it matches subjects like:

• ele verifica — he checks
• ela verifica — she checks
• o mecânico verifica — the mechanic checks

In this sentence, it can describe:

• a habitual action: The mechanic checks...
• or a present action in a simple description: The mechanic is checking...

Portuguese often uses the simple present in places where English might prefer is checking.

Because Portuguese nouns have grammatical gender.

• suspensão is feminine, so it takes a
• alinhamento is masculine, so it takes o

So:

• a suspensão
• o alinhamento

This does not mean the objects are biologically female or male. It is just a grammatical feature of the nouns.

Portuguese normally gives each noun its own article in a phrase like this, especially when the nouns have different genders.

So:

• a suspensão e o alinhamento

sounds natural and correct.

Because one noun is feminine and the other is masculine, you cannot use one article for both. The article has to match each noun individually.

They are singular because the sentence is talking about the car’s suspension and alignment as systems or conditions.

This is similar to English, where you would also normally say:

• the suspension
• the alignment

not the suspensions or the alignments, unless you were talking about multiple vehicles or multiple separate systems.

In a normal full sentence, that is usually not the most natural choice.

Standard Portuguese strongly prefers the articles here:

• O mecânico verifica a suspensão e o alinhamento.

Without the articles, the phrase can sound abbreviated, technical, or headline-like. You might see article omission in:

• notes
• lists
• workshop checklists
• very compressed instructions

But for standard spoken or written Portuguese, keep the articles.

A rough Brazilian Portuguese pronunciation guide is:

• mecânico → meh-KAH-nee-koo
• suspensão → soos-pen-SOWN

A few important points:

• In mecânico, the stress is on câ.
• In suspensão, the stress is on the final são.
• The ending -ão is nasal, which English does not really have. Try to let the sound come through the nose a bit.

These are only approximations, but they help with the rhythm.

The lh in Brazilian Portuguese is a special sound that does not match a single English letter.

A good approximation is the lli sound in words like million for many English speakers.

So alinhamento is roughly:

• ah-leen-yah-MEN-too

The lh is not the same as a plain English l. It is a softer, more palatal sound.

The accents help show pronunciation.

• mecânico has â, which helps show the stressed syllable: me-CÂ-ni-co
• suspensão has ã, which marks a nasal vowel in the stressed ending: sus-pen-SÃO

In Portuguese, accent marks are very useful because they tell you things like:

• which syllable is stressed
• whether a vowel is open or closed
• whether a vowel is nasal

So they are not optional spelling marks; they are part of the correct spelling.

Yes, in this sentence verificar is a very good match for to check.

It is a common and fairly neutral verb, and it works especially well in technical or professional contexts, like mechanics, inspections, manuals, and reports.

Some related verbs are:

• checar — also to check, a bit more informal or more obviously borrowed in feel
• conferir — can mean to check, to verify, or to make sure

For a mechanic inspecting parts, verificar sounds very natural.

Yes. That is also correct.

The difference is:

• verifica = simple present; can mean checks or is checking, depending on context
• está verificando = explicitly is checking right now

So:

• O mecânico verifica a suspensão e o alinhamento.
  can sound like a general statement, a caption, or a present-time description

• O mecânico está verificando a suspensão e o alinhamento.
  clearly emphasizes the ongoing action at this moment

Both are good; the second one is just more specific about the action being in progress.