- They were not at school this morning.
- Were they at school this morning?
- Tom did not go to the hospital to provide food two weeks ago.
- Did Tom go to the hospital to provide food two weeks ago?
- The sidewalks were not wet after the rain.
- Were the sidewalks wet after the rain?
- I did not start to work as a volunteer three years ago.
- Did I start to work as a volunteer three years ago?
- They were not in the library an hour ago.
- Were they in the library an hour ago?
- Tom and his friend did not go to orphanages to learn English yesterday.
- Did Tom and his friend go to orphanages to learn English yesterday?