Breakdown of De cambiar el engranaje, se usará la herramienta correcta.
usar
to use / to wear
la
the (feminine)
correcto
correct
se
(impersonal) one / passive marker
la herramienta
the tool
cambiar
to change
de
if (+ infinitive)
el engranaje
the gear
Questions & Answers about De cambiar el engranaje, se usará la herramienta correcta.
Why does this sentence start with De cambiar instead of Si se cambia?
Using de followed by an infinitive is a formal and concise way to set up a condition. It functions just like a regular si (if) clause. Here, De cambiar el engranaje translates best as "In the event of changing the gear" or "If the gear is changed."
Could I use the perfect infinitive here and say De haber cambiado el engranaje?
Not in this sentence. De haber cambiado means "If [someone] had changed," which is a past, unreal condition. If you used that, the main clause would need the conditional perfect: se habría usado (the correct tool would have been used). Because the main clause here uses the future tense (se usará), you must use the simple infinitive (de cambiar) to show a possible future event.
What is the function of se in se usará?
If de cambiar doesn't conjugate for a person, who is the subject doing the changing?
The subject is left intentionally vague. Because an infinitive is used, and the main clause relies on the passive se usará, the entire sentence is impersonal. It relies on context to imply that whoever happens to be doing the mechanical work is the one changing the gear.
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