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Should English countable nouns be plural or singular when representing categories (such as writing words or phrases according to pictures)?
Countable nouns can be singular or plural when they represent categories. But many times it is singular and rarely plural.

For example,

What kind of apples do you like?

What kind of apples do you like?

What kind of apple are you?

Apple is a countable noun. But when it comes to categories, Apple doesn't add-s. .....

however

I have all kinds of fish. When you use variety, variety becomes plural. But the fish didn't add -es