- Where do you live?
- Who did you see?
- Who plays football in this class?
- What happened?
- Which machine did Marconi invent?
|Object Questions wh- + auxiliary + subject + main verb||Where do you live?|
What will you do?
When is she coming?
|Subject Questions wh- (=subject) + auxiliary + main verb|
Notice that this structure is like affirmative sentence structure without the question word.
|Who loves you?|
Which car will arrive first?
What type of food costs less?