Question

Fill in the blanks with am, is ,are.
There ___a number of books in the cupboard.​

Answer 1

Answer:

"The number of" should always be used with a plural of a countable noun. The phrase "the number of Xs" then acts as a singular subject for the verb, so the third person singular form of the verb should be used. The number of families has changed.

Explanation:

are

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