A. Just have singular form (they refer to 1 thing, animal, person, etc.)
B. Have both Singular and Plural form (they refer to 1, 2 or more things, animals, people, places, etc.)
Polite RequestGerund vs. InfinitiveFew vs. LittlePresent TenseOrdering AdjectivesAbilityPresent ContinuousPresent Simple for Future ArrangementGerund
Other quiz: Grammar
A number of people _______________ following a demonstration in central London.
A. have arrested
B. has been arrested
C. have been arrested
D. was arrested
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