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How do we confirm whether "riches" is a countable or an uncountable noun?
Why do we need "the" before "riches"?
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JigneshbharatiHow do we confirm whether "riches" is a countable or an uncountable noun?

Riches is a plural noun. There is no singular form. It is uncountable.
If there is no singular form, you cannot have one of them.


Refer to the definition:

https://dictionary.cambridge.org/dictionary/english/riches

JigneshbharatiWhy do we need "the" before "riches"?

"The" refers to specific riches, those which can be found in the dictionary.

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JigneshbharatiHow do we confirm whether "riches" is a countable or an uncountable noun?

In the sense that we can't have "one rich", "two riches", ..., it is not countable.

JigneshbharatiWhy do we need "the" before "riches"?

Because it is talking about some specific riches: those of the English language.

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Comments  
JigneshbharatiHow do we confirm whether "riches" is a countable or an uncountable noun?

It is from Middle English, a corrupted spelling of the borrowed French richesse, wealth. It can't be countable because you can't have one rich.

JigneshbharatiWhy do we need "the" before "riches"?

Same reason you ever need it anywhere. They are talking about the ones that you find in the English language.

 GPY's reply was promoted to an answer.
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