When the word "kind" is used for "type", I don't know the number of the noun following it.
Would you say "a kind of food", "three kinds of food"?
Would you say " a kind of apple (apples)", "three kinds of apple (apples)"?
What is the difference between "What kind of music do you enjoy?" and " What music do you enjoy?" thank you.
EX: Some people think alcohol is a kind/a type of food.
EX: An onion is not a kind/a type of apple!

EX: There are three kinds/three types of apples in the salad.
EX: There is only one kind/one type of apple on that tree.

EX: What kind of music do you enjoy?
EX: What (kind of) music do you enjoy? (Note, 'kind of' can be omitted.)

The use of "kind of" is really messy for learners. The messiness comes from the fact that "kind of" is a relic of genitive use of 'kind' in Old English. Anyway, what I have learned is;

'this kind [sort, type] of X' and 'this kind [sort, type] of Xs'
They are the same in meaning. The former is more formal and much commoner.

'these kinds [sorts, types] of X' and 'these kinds [sorts, types] of Xs'
They are the same in meaning. The latter is a bit less formal but much commoner.

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I go shopping for a bag. There are thousands of bags in the store. The store has different kinds of bags.

“Kinds of bag”, “kinds” is in plural because there is more than one kind. Why is “bags” in plural? I think it is because there is more than one bag of each type.

So, can I say “this type of sentences” if I have more than one sentence of one single type?

Please, help me to understand when to use the plural and singular with "kind" or "type."

 paco2004's reply was promoted to an answer.
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