Quick answer
Trocar replaces one item with another. Mudar alters a situation or moves someone to a new place.
A reliable test is to identify the job of the word before translating from English.
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What each word does
trocar
to exchange, replace, or switch
Use trocar for one thing taking the place of another, often in a direct swap.
mudar
to change or move
Use mudar for a change of state, habit, opinion, address, or residence.
How to choose
- trocar: Choose trocar if the sentence points to one thing taking the place of another, often in a direct swap.
- mudar: Choose mudar if the sentence points to a change of state, habit, opinion, address, or residence.
Examples
Vou trocar esta camisa.
I am going to exchange this shirt.
Nós vamos mudar de cidade.
We are going to move to another city.
Common trap
For clothes, money, seats, or one object for another, trocar is usually precise. For life changes and moving house, use mudar.
Practice it in context
Pick one sentence from your real life and write it twice: once with trocar, then once with mudar. If both versions feel possible, name the meaning shift.
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