Breakdown of La mayoría de los tomos antiguos necesitan ser encuadernados pronto.
ser
to be
de
from / of
necesitar
to need
pronto
soon
antiguo
ancient
la mayoría
the majority
encuadernar
to bind
el tomo
volume (book)
Questions & Answers about La mayoría de los tomos antiguos necesitan ser encuadernados pronto.
Why is the verb necesitan plural if the subject starts with the singular phrase la mayoría?
This is an example of agreement by sense (concordancia ad sensum). When a singular collective quantifier like la mayoría de (the majority of) is followed by a plural noun like los tomos (the volumes), the verb usually takes the plural form (necesitan) because the actual objects needing the action are plural.
Would it be grammatically incorrect to use the singular verb necesita here?
It wouldn't be strictly incorrect, but it is much less natural. If you did use the singular necesita to agree with the grammatical head of the phrase (la mayoría), you would create a domino effect: the past participle at the end would also have to change to match that feminine singular subject. The sentence would become: La mayoría... necesita ser encuadernada.
Why does encuadernados have an -s at the end if it's part of an infinitive phrase (ser encuadernados)?
This is the passive voice in its infinitive form (ser + past participle). In Spanish, whenever you use the passive voice, the past participle acts like an adjective and must agree in gender and number with the subject receiving the action. Since it refers back to los tomos antiguos (masculine plural), it becomes encuadernados.
What is the difference between a tomo and a regular libro?
While libro is the general word for book, a tomo translates specifically to volume. You use tomo when referring to a single physical book that makes up part of a larger series, collection, or multi-volume work (like an encyclopedia or a long historical text).
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