Confused with how to use " kind of ":
What kind of a person are you?
What kind of person are you?
What kind of people are they?
What kinds of people are they?
Can you tell me which sentences are correct? And what is the difference between them?
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"What kind of a(n)" is much less common than "What kind of" without an article (2093 instances in the NOW corpus, out of a total of 35175 instances of "what kind of"). But it is perfectly grammatical, and there are some well known quotes which use it. If you search for
What kind of a girl ...
What kind of a life ...
you will find many hits.
NO. 4 is also less common, because we don't often talk about more than one kind of thing at a time; but it's perfectly grammatical.
The 2nd and 3rd one are correct. Other two are wrong.
In first sentence, "What kind of a person are you?" - We don't use "a" in such kind of sentences. In other words, you can say that article doesn't come after "kind of"
In 4th sentence, "What kinds of people are they" - You are supposed to use the singular form. "Kinds" is incorrect grammatically.
Here are few other examples that might help improve your understanding.
What kind of smell is this?
We don't often hear such kind of noise.
I despise this kind of person.
I don't like these kind of cakes.