Mudámos o estilo.

In European Portuguese, the acute accent in mudámos shows that the stress falls on dá: mu-DÁ-mos.

It also helps distinguish two different forms:

• mudámos = we changed (past)
• mudamos = we change (present)

So for a learner of Portuguese from Portugal, that accent is very useful.

Mudámos is the pretérito perfeito simples.

This tense is used for a completed action in the past. In other words, the change happened and is seen as finished.

A useful comparison:

• mudámos = we changed
• mudávamos = we were changing / we used to change
• mudamos = we change

Because Portuguese often omits subject pronouns when the verb ending already makes the subject clear.

Here, -ámos clearly tells you the subject is we.

So:

• Mudámos o estilo. = normal and natural
• Nós mudámos o estilo. = also correct, but usually adds emphasis, contrast, or extra clarity

For example:

• Eles mantiveram o estilo, mas nós mudámos o estilo.

Yes, absolutely.

Both are correct:

• Mudámos o estilo.
• Nós mudámos o estilo.

The version without nós is often more natural in everyday Portuguese, because the verb already tells you who did the action.

You would add nós if you want to stress we:

• Nós mudámos o estilo, não foram eles.

The infinitive is mudar, meaning to change.

Yes, it is a regular -ar verb.

That is why mudámos follows a common pattern for the we form in the past:

• falar → falámos
• mudar → mudámos
• comprar → comprámos

So once you know one regular -ar pattern, many others work the same way.

Because estilo is a masculine singular noun, so it takes o:

• o estilo = the style

If the noun were feminine singular, you would use a instead.

So this is really a gender agreement question:

• o
  • masculine singular noun
• a
  • feminine singular noun

In Portuguese, the definite article is used very naturally with nouns when you mean a specific thing.

So Mudámos o estilo means we changed the style — a particular style, such as the style of a website, document, brand, room, etc.

Without the article, Mudámos estilo would sound incomplete or unnatural in most normal contexts.

This is a very useful distinction.

• Mudámos o estilo = we changed the style
  This means you changed a particular style or design.

• Mudámos de estilo = we changed style / we switched styles
  This means you moved from one style to another.

So:

• Mudámos o estilo do site. = We changed the website’s style.
• Mudámos de estilo. = We changed style.

English often uses change in a broad way, but Portuguese may choose either a direct object or de depending on the meaning.

A rough English-friendly approximation is:

moo-DAH-moosh oo sh-TEE-loo

A few important points:

• The stress in mudámos is on dá
• The o in o sounds like oo
• In European Portuguese, the beginning of estilo is often very reduced, so to English ears it can sound a bit like shtilo or ishtilo

So the phrase may sound more compressed than you expect.

Yes, the spelling mudámos strongly points to European Portuguese.

In Brazilian Portuguese, you will very often see:

• Mudamos o estilo

for both we changed and we change, with context showing which meaning is intended.

So if you are learning Portuguese from Portugal, mudámos is exactly the kind of form you should pay attention to.

In standard European Portuguese, the direct object pronoun for it referring to o estilo is o.

So We changed it can become:

• Mudámo-lo.

This is more advanced because the verb and pronoun combine in a special way:

• mudámos + o → mudámo-lo

That happens because the verb form ends in -s, and with these pronouns Portuguese changes the form a bit.

In everyday speech, many speakers may prefer to rephrase instead of using this combined form, but it is a correct and useful pattern to know.