Agreement

agreement
The subject and the verb of a clause have to agree in number and person.
person
number
pronoun(s)
to be
to write
1st
singular
I
am
write
1st
plural
we
are
write
2nd
singular
you
are
write
2nd
plural
you
are
write
3rd
singular
he, she, it
is
writes
3rd
plural
they
are
write
Writers sometimes fail to make the verb of a sentence agree with the subject. This usually happens when the subject of the sentence is a lengthy noun phrase. For example:
The advent of digitization and electronic media make speedy cooperation between us even more necessary.
This should be:
The advent of digitization and electronic media makes speedy cooperation between us even more necessary.
The rule is that the verb should agree with the main word in the subject, the headword of the phrase. If in doubt, you should try to boil the subject down to a single noun or pronoun. In this case the subject boils down to advent, which is singular.

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