Collective adjectives
By combining an adjective and the definite article ‘the’, you can create a noun, like this:
Robin Hood stole from the rich and gave to the poor.
By combining the definite article ‘the’ and the adjective ‘rich’, you create a phrase, which is effectively just a noun - ‘the rich’. Same with ‘the poor’.
So you use ‘the’ and an adjective to form a collective noun, as they’re known. If you use a verb with a collective noun, you need to use the plural form of the verb:
The poor were grateful to Robin Hood.
‘Were’ is a linking verb and is the plural form of the verb ‘was’.
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