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into yes-no questions (such as "Are you hungry?") and alternative questions (such as "Do you want jam or marmalade?").

The distinction between these classes tends to be grammaticalized. In English, open and closed interrogatives are distinct clause types characteristically associated with open and closed questions, respectively.

Yes-no questions

A yes-no question (also called a polar question, or general question) asks whether some statement is true. They can, in principle

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