a)1) Fred took his dog for a walk last week.2) Mary got up at 7 o'clock yesterday.
b)1) Did Fred take his dog for a walk last week?2) Did Mary get up at 7 o'clock yesterday?
c)1) Fred did not take his dog for a walk last week.2) Mary did not get up at 7 o'clock yesterday.
a)
1) Fred took his dog for a walk last week.
2) Mary got up at 7 o'clock yesterday.
b)
1) Did Fred take his dog for a walk last week?
2) Did Mary get up at 7 o'clock yesterday?
c)
1) Fred did not take his dog for a walk last week.
2) Mary did not get up at 7 o'clock yesterday.