"The terms of reference ... are specifically in relation to the actions of one detective constable and do not cover whether senior Surrey officers knew about the News of the World hacking Milly Dowler's phone in 2002." [From The Independent.]
I've looked up in dictionaries the word 'whether' and found that it can be a conjunction, a noun, an adjective and adverb but not a preposition. I understand that the clause, an indirect question, whether senior Surrey officers knew about the News of the World hacking Milly Dowler's phone in 2002 is an object of the verb 'cover' in the cited sentence.
My question is: what the part of speech is the word 'whether' in this sentence?
Thank you.
Top answer
2002'.
— Mister Micawber
2002'.
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