To form questions in the passive, we put the
auxiliary verb before the subject. If there is more
than one auxiliary verb, only the first one goes
before the subject.
✓ Was Mr Jenkins arrested yesterday?
✓ Has Mr Jenkins been arrested?
With the question words who and what, we use
do as an auxiliary verb if the question word
refers to the object of the verb.
✓ Who told you? ( = Someone told you. Who?)
✓ Who did you tell? ( = You told someone. Who?)
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