I. Turn into the passive voice.
- Active voice : Do / Does / Did + \(S_1\) + V + \(O_2\) + adv (place) + adv (time) ?
- Passive voice : Is / Am / Are / Was / Were + \(S_2\) + \(V_{pp}\) + adv (place ) + [ by + \(O_1\) ] + adv (time) ?
1. Did they usually lock the safe carefully last year ?
-->.............................................................................?
2. Do the police question everybody in the house ?
-->.............................................................................?
3. Does a machine do this much more easily ?
-->.............................................................................?
4. Did they introduce you to the students last week ?
-->.............................................................................?
5. Mr.Pike left those documents on the desk.
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6. They didn't send the letters to the leaders.
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7. Did they build a new university two years ago ?
-->.............................................................................?
8. Does Mary pick the fruit very early in the morning ?
-->.............................................................................?
9. Miss Hoa doesn't water the trees and flowers every evening.
-->.............................................................................?
10. Do people make plans at school every summer ?
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