Vincent Teo When / How / Where does this machine work? All three are possible. Vincent Teo When / How / Where was the last time you visited your grandfather?
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Vincent TeoWhen / How / Where does this machine work?All three are possible.
Vincent TeoWhen / How / Where was the last time you visited your grandfather?'When' is the most likely choice, but 'where' is just about possible in informal speech.
Vicky NgôThis sentence, "How was the last time you visited your grandfather?" does not work.It's possible in informal speech.