"a number of" / "the number of"

 

Tell your students to think of it this way: a number of means many. Because “many + plural noun” takes a plural verb, you would say “Many cars are on the freeway during rush hour.” Likewise, you would say “A number of cars are on the freeway during rush hour.”

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In English, “the number of” doesn’t mean “many.” Tell your students to think of it as one number. So even though that number might be large, the purpose of this expression is to compare this one number/amount with another number/amount. For example, we would say “The number of crimes in New York has increased this year.” There might be 56 more crimes committed this year compared to last year. Another example is “The number of people who are writing the test today is larger than yesterday.” There might be 20 more people writing the test today.





Reference.
https://blog.esllibrary.com/


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