I would say "quite apprehensive about asking this". This is an informal conversational sentence. As such, it does not have to conform to quite the same standards of structure as would be the case in formal written English.
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AnonymousIf I may, could I ask you a question? I don't know whether to insert a word in a phrase or not.I don't understand what you are asking. "insert a word in a phrase" could mean anything.