Speculations (must, Have)

1.- I can't have been reading
2.- She must have been studying
3.- he might have been eating
4.- they must have been playing
5.-the dog could have been barking
6.- we can't have been breking the paper
7.- It might have been runnig in the house
8.- they can't have been shutting in the office
9.- I can't have been writing in my door
10.- she can't have been using a swimsui