I'm trying to figure out what this sentence is, and the Passive Past Perfect Continuous Interrogative is the best that I can think of.
Where have all the reference books been put?
It has the "have been + present part." form of the Past Perfect Continuous.
Would 'have' and 'been' be considered auxiliary here?
Does the determiner "all" function as a subject compliment?
What is "where"?
Is this correct:
Where: Adverbial
have: aux
all: subject compliment
the reference books: subject
been: aux
put: transitive verb
In passive voice, if something would normally be a transitive verb acting on what becomes the subject, is it still considered a transitive verb?