Breakdown of Temos de mudar a fralda já que está suja.
estar
to be (temporary / location)
sujo
dirty
ter de
to have to
mudar
to change
já que
since (reason)
a fralda
the diaper
Questions & Answers about Temos de mudar a fralda já que está suja.
Why do we use já que here instead of porque?
Já que translates to "since" or "given that". While you could absolutely use porque (because) here, já que is often preferred when the reason is an established fact or already visually obvious to the people speaking. In this case, the diaper being dirty is the given circumstance prompting the action.
Could I say Temos que mudar instead of Temos de mudar?
Yes, in everyday spoken Portuguese, you will hear temos que mudar all the time. Strictly speaking in formal grammar, ter de is preferred for expressing a strong obligation ("have to"), whereas ter que traditionally implies having a physical thing to do (as in tenho coisas que fazer). At a B2 level, it is best to write ter de for obligations, but expect native speakers to use both interchangeably in speech.
Are both mudar and trocar acceptable for changing a diaper?
Yes, both mudar a fralda and trocar a fralda are perfectly natural and widely used in Portugal. While mudar means "to change" in a broad sense, trocar emphasizes the specific act of "swapping" or "exchanging" the dirty diaper for a clean one.
How do we know the subject of está suja if there is no pronoun?
Portuguese frequently drops subject pronouns when the context makes them obvious. Here, the verb phrase está suja refers directly back to a fralda. The adjective suja acts as a built-in grammatical clue: it is feminine and singular, agreeing perfectly with a fralda, so we know exactly what is dirty without needing the pronoun ela.
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