Breakdown of Caso haja uma falha de eletricidade, usamos o gerador.
de
of / from / by (means of transport) / wearing (attire)
um
a / an / some (all forms)
haver
to be (there is / there are)
usar
to use / to wear
a eletricidade
the electricity
caso
in case
a falha
the failure
o gerador
the generator
Questions & Answers about Caso haja uma falha de eletricidade, usamos o gerador.
Why do we use haja instead of the normal present tense há?
The word caso (in case) is a conditional conjunction that introduces a hypothetical scenario. In Portuguese, this specific word always triggers the subjunctive mood. So, instead of the present indicative há (there is), we must use the present subjunctive form haja.
Is haja from the verb haver? I thought people used ter for 'there is'.
Yes, haja is the present subjunctive of haver. While it is very common in informal spoken Portuguese to use ter to say 'there is' or 'there are', standard European Portuguese prefers haver when expressing existence in this way.
If I want to say 'If there is a power failure', can I just use se instead of caso?
You can, but it changes the grammar rule. If you use se (if) for a hypothetical future event, it requires the future subjunctive tense, making the phrase se houver uma falha. The word caso is unique because it expresses a similar conditional idea but pairs with the present subjunctive instead.
Why is the second half of the sentence (usamos) in the present indicative tense rather than a future tense?
Using the present indicative (usamos) for the result shows that this is an established plan or a general rule. It translates nicely to 'we use' but acts as 'we will definitely use'. You could use the future tense (usaremos), but the present tense is very common and natural here for a standard procedure.
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