| Subordinate yes-no interrogative clauses |
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Subordinate "yes-no" interrogative clauses are introduced by whether or if. If tends to be more common than whether in informal style but you have to be careful because if is more restricted syntactically than whether. Subordinate "yes-no" interrogative clauses don't usually have subject operator inversion (the verb is not in the interrogative form: ...auxiliary verb + subject ...) and they may function as subject, direct object, subject complement, appositive, etc. like subordinate wh-interrogative clauses:
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