O Pedro está ao lado da Ana.

In European Portuguese, it is very common to use the definite article before a person’s first name:

• o Pedro
• a Ana

This is much more natural in Portugal than it is in English, where names usually appear without an article. So O Pedro está ao lado da Ana sounds normal and everyday in European Portuguese.

The article matches the person’s gender:

• o for a masculine singular noun/name
• a for a feminine singular noun/name

Portuguese has two verbs that both often translate as to be:

• ser → for identity, permanent characteristics, origin, time, etc.
• estar → for location, condition, temporary state

Here, Pedro’s position is being described, so Portuguese uses estar:

• O Pedro está ao lado da Ana.

Using é here would be wrong.

Ao lado de is a fixed expression meaning:

• next to
• beside
• at the side of

So:

• ao lado da Ana = next to Ana

It is best to learn ao lado de as one chunk, because that is how Portuguese normally expresses this idea.

Because ao is a contraction of:

• a + o = ao

Here, lado is a masculine singular noun, so it takes o:

• a + o lado → ao lado

This is part of the fixed expression ao lado de.

Because Portuguese normally contracts de + a into da:

• de + a = da

So:

• ao lado de a Ana → ao lado da Ana

These contractions are standard and expected in normal Portuguese.

Some useful related contractions are:

• de + o = do
• de + a = da
• de + os = dos
• de + as = das

Yes. Literally, it is something like:

• at the side of Ana

Breakdown:

• ao = at/to the
• lado = side
• da Ana = of Ana

But in natural English, you translate it as next to Ana or beside Ana, not word for word.

Yes, you can. Junto de or junto a can also mean next to or close to, depending on context.

For example:

• O Pedro está junto da Ana.

However, ao lado de is very clear and very common when you mean physical position right beside someone.

Sometimes you may hear or see names without articles, but in everyday European Portuguese, the articles are very natural here. So:

• O Pedro está ao lado da Ana. → very natural in Portugal

Without the articles:

• Pedro está ao lado de Ana.

This is understandable, but it sounds less typically European Portuguese in ordinary speech. It may feel more formal, less idiomatic, or closer to other varieties.

Yes. That is also correct:

• A Ana está ao lado do Pedro.

It describes the same physical situation from Ana’s point of view instead of Pedro’s.

Notice the contraction:

• de + o Pedro = do Pedro

So:

• ao lado do Pedro

In European Portuguese, está is pronounced roughly like shtah.

A few things to notice:

• the e at the beginning is often reduced
• the st cluster sounds closer to sht for many learners’ ears
• the stress is on the last syllable: -tá

So está does not sound like a fully clear es-TA in careful English-style pronunciation.

No. By itself, it only tells you where Pedro is:

• Pedro is next to Ana

It does not imply anything about their relationship. It is just a statement of position or location.

Lado is a noun meaning side.

In the expression ao lado de, it keeps its noun form, but the whole phrase functions like a prepositional expression meaning next to or beside.

So although lado is a noun, learners should understand ao lado de as a set phrase used to locate people or things.