Where ___ (did they go/went) on holiday?
did they go (Object Question).
Who ___ (did you meet/met) at the park?
did you meet (Object Question).
What ___ (happened/did happen) at school today?
happened (Subject Question).
Who ___ (wrote/did write) this book?
wrote (Subject Question).
What ___ (did she say/said) to you?
did she say (Object Question).
Who ___ (saw/did see) the movie yesterday?
saw (Subject Question).
What ___ (broke/did break) the window?
broke (Subject Question).
What ___ (happened/did happen) in the movie?
happened (Subject Question).
What ___ (did you buy/bought) at the store?
did you buy (Object Question).
Who ___ (did call/called) you last night?
called (Subject Question).
Who ___ (did they invite/invited) to the party?
did they invite (Object Question).
Who ___ (did see/saw) the accident?
saw (Subject Question).
Who ___ (helped/did help) you with your homework?
helped (Subject Question).