The use of kind sometimes causes difficulty, as in as in these kind of questions are not relevant where the plurals these and are used with the singular kind. With this or that, speaking of one kind, use a singular construction: this kind of question is not relevant; that kind of fabric doesn’t need ironing. With these or those, speaking of more than one kind, use a plural construction: we refuse to buy these kinds of books; I’ve given up those kinds of ideas. The ungrammatical these kinds has been used since the 14th century, but although often encountered today it should be avoided.
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