Spanish Phrase
Ajusta la temperatura cuando haga falta.
Meaning
This phrase is a direct instruction to change the temperature setting as required. The idiomatic expression "cuando haga falta" means "when it's necessary" or "when it's needed," implying that the action should be taken at the appropriate moment.
When to use
You would use this phrase to tell someone to modify a thermostat, air conditioning, or heating system. It's a practical instruction often given in homes, offices, or any setting with adjustable temperature controls.
✦Grammar Breakdown
Ajustala temperaturacuandohaga falta
Ajusta (Ajustar)
This is the informal 'tú' command form of the verb 'ajustar' (to adjust). It's used when giving an instruction to a single person you know well.
La temperatura
'La' is the definite article 'the,' and 'temperatura' is the feminine noun for 'temperature.' It's a common noun in everyday conversation.
Cuando haga falta
This is a common idiomatic expression meaning 'when it's necessary' or 'when needed.' 'Haga' is the present subjunctive form of 'hacer' (to do/make), used here because 'cuando' introduces a clause referring to an indefinite or future time.
🗨In Conversation
Hace un poco de frío aquí, ¿no crees?
It's a bit cold here, don't you think?
Sí, tienes razón. Ajusta la temperatura cuando haga falta.
Yes, you're right. Adjust the temperature when necessary.
✕Common Mistakes
Ajusta la temperatura cuando necesita.
The phrase "cuando haga falta" uses the subjunctive "haga" because it refers to a future or hypothetical necessity, not a current fact. "Necesita" is indicative.
Ajusta la temperatura cuando es falta.
"Hacer falta" is the correct idiomatic expression for "to be needed" or "to be necessary." "Ser falta" is not grammatically correct in this context.
↔Alternatives
Cambia la temperatura si es necesario.
Change the temperature if it's necessary.
Regula la temperatura según se necesite.
Regulate the temperature as needed.
Sube o baja la temperatura cuando lo requiera.
Raise or lower the temperature when it's required.
Cultural Tip
In many Spanish-speaking cultures, direct commands like "Ajusta..." are common in practical contexts, especially within a family or among close colleagues. To soften the tone, you can add "por favor" (please) at the end, making it "Ajusta la temperatura cuando haga falta, por favor." This phrase is generally neutral in register.