Subject-verb agreement in sentences with quantifiers

Some colective nouns, such as
staff, majority, and minority, can have a singular or plural verb (he takes=singular; they take=plural).

If the noun refers to the individual members of a unit, the verb is plural:

The
majority of people in the world speak more than one language.
  (notice that in Portuguese we say 'a maioria fala'; we use a singular verb.
Only a
minority of U.S. students write correctly when they enter college.

If the noun refers to a whole unit, the verb is singular:

In the U.S.,
Spanish speakers constitute a linguistic minority that is growing rapidly.

None, each, and every one are followed by a singular verb:

None of my friends knows how to write good business letters.
Each of the instructor in the scholl has a different teaching style.

All (of), a lot of, lots of, some, most, plenty, and fractions are followed by a singular verb if the noun they modify is uncountable or singular and by a plural verb if the noun they modify is plural, like in Portuguese:

A lot of contact with native speakers helps to learn a second language better.
Half of the textbook is about improving your communication skill.
A lot of second language learners have difficulty using informal English.
Half of the chapters in the book deal with improving writing skills.

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