Mudar

Mudar means to change — but it splits into three distinct uses that English packs into a single word, and the difference between them lives almost entirely in the preposition (or its absence). Mechanically the verb is the easy part: it is a completely regular -ar verb, no stem change, no spelling trick, regular participle (mudado). The real lesson is choosing between bare mudar, mudar de, and the reflexive mudar-se.

The three meanings

English change is famously slippery — you change the world, you change your shirt, you change jobs, you change (move) house. Portuguese sorts these out structurally:

• mudar (no preposition, transitive or intransitive) = to change in the sense of to alter / transform / make different.
• mudar de
  • noun = to change in the sense of to swap one thing for another (job, opinion, subject, channel).
• mudar-se (reflexive) = to move — change one's place of residence.

That second example shows mudar used intransitively — the weather itself changed. No object, no preposition. When something simply becomes different on its own, bare mudar is right.

mudar de: swapping one thing for another

This is the use English speakers most often get wrong, because in English you just say change jobs, change your mind, change the subject with a bare object. In Portuguese, when you mean exchange X for a different X of the same kind, you need de:

The logic: mudar de emprego literally frames it as moving away from one job (toward another) — the de marks the thing you are leaving behind. This is the same de of departure you see in sair de casa (leave the house). Once you feel that "moving away from" sense, the preposition stops feeling arbitrary.

mudar-se: moving house

To move — relocate where you live — Brazilians use the reflexive mudar-se, or extremely commonly in speech, just mudar with a destination phrase. The plain mudar de casa (change houses) is also everyday.

In Brazilian Portuguese the pronoun usually comes before the verb in everyday speech and in most clauses: eu me mudei, eles se mudaram. This is one of the clearest PT-BR vs. PT-PT contrasts: European Portuguese would more readily write mudei-me with the pronoun attached after, whereas Brazil overwhelmingly prefers the proclitic me mudei in conversation.

Presente do indicativo

Pretérito perfeito

Note that mudamos is identical in the present and the preterite — context disambiguates, exactly as English we change / we changed would never collide but Portuguese nós forms sometimes do.

Pretérito imperfeito

Futuro do presente & futuro do pretérito (conditional)

Built on the full infinitive mudar-.

In speech, the periphrastic ir + infinitive dominates the simple future: vou mudar rather than mudarei. (informal)

Presente do subjuntivo

-ar verbs switch to -e endings.

Imperfeito & futuro do subjuntivo

Imperativo

Notice that in real Brazilian speech the imperative for você often takes the tu form muda (Não muda!) rather than the prescriptive não mude — a hallmark of colloquial BR imperative usage. (informal)

Non-finite forms

Common Mistakes

Key Takeaways

• Mudar is a fully regular -ar verb; the participle is the regular mudado.
• mudar (bare) = alter/transform; mudar de = swap one thing for another (job, mind, subject); mudar-se = relocate.
• The collocation to drill is mudar de ideia — no possessive, ideia singular.
• In BR speech the reflexive pronoun goes before the verb: eu me mudei, eles se mudaram.
• Present subjunctive uses -e endings: mude, mudes, mude, mudemos, mudem.