Breakdown of Para diciembre, ellos habrán reducido las emisiones globales.
ellos
they
para
for
diciembre
December
haber
(auxiliary) have
reducir
to reduce
global
global
la emisión
emission
Questions & Answers about Para diciembre, ellos habrán reducido las emisiones globales.
Why do we use habrán reducido here instead of just the normal future tense?
Habrán reducido is the future perfect tense, which is used to talk about an action that will be completed before a specific time in the future. If we used the normal future tense (reducirán), it would mean they will do the reducing in December, rather than having the work already finished by the time December arrives.
Why does the sentence use para instead of por to mean 'by' December?
Since emisiones is feminine and plural, shouldn't the past participle be reducidas?
No, because it is part of a compound tense using the helper verb haber (habrán). When a past participle follows any form of haber, it is locked in its default masculine singular form ending in -o. It would only change to match gender and number if it were used purely as an adjective, like if you were simply saying las emisiones reducidas.
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