2.2.2.3 Yes/no interrogative clause
This can function as subject, subject complement, direct object, appositive,
adjective complement and prepositional complement.
Subject: Whether he can do the job is a question
Subject complement: The question is whether he can do the job
Direct object: I don‘t know if it is raining
Appositive: The destiny - whether he dies or not - is hard to answer
Prepositional complement: They talk about whether or not she cried
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