I could bellyache you could bellyache he could bellyache we could bellyache you could bellyache they could bellyache
V-ing form
I could be bellyaching you could be bellyaching he could be bellyaching we could be bellyaching you could be bellyaching they could be bellyaching
Perfect
I could have bellyached you could have bellyached he could have bellyached we could have bellyached you could have bellyached they could have bellyached
V-ing perfect
I could have been bellyaching you could have been bellyaching he could have been bellyaching we could have been bellyaching you could have been bellyaching they could have been bellyaching
Negation
Simple form
I couldn't bellyache you couldn't bellyache he couldn't bellyache we couldn't bellyache you couldn't bellyache they couldn't bellyache
V-ing form
I couldn't be bellyaching you couldn't be bellyaching he couldn't be bellyaching we couldn't be bellyaching you couldn't be bellyaching they couldn't be bellyaching
Perfect
I couldn't have bellyached you couldn't have bellyached he couldn't have bellyached we couldn't have bellyached you couldn't have bellyached they couldn't have bellyached
V-ing perfect
I couldn't have been bellyaching you couldn't have been bellyaching he couldn't have been bellyaching we couldn't have been bellyaching you couldn't have been bellyaching they couldn't have been bellyaching
Interrogative form
Simple form
could I bellyache? could you bellyache? could he bellyache? could we bellyache? could you bellyache? could they bellyache?
V-ing form
could I be bellyaching? could you be bellyaching? could he be bellyaching? could we be bellyaching? could you be bellyaching? could they be bellyaching?
Perfect
could I have bellyached? could you have bellyached? could he have bellyached? could we have bellyached? could you have bellyached? could they have bellyached?
V-ing perfect
could I have been bellyaching? could you have been bellyaching? could he have been bellyaching? could we have been bellyaching? could you have been bellyaching? could they have been bellyaching?
Interro-negative form
Simple form
couldn't I bellyache? couldn't you bellyache? couldn't he bellyache? couldn't we bellyache? couldn't you bellyache? couldn't they bellyache?
V-ing form
couldn't I be bellyaching? couldn't you be bellyaching? couldn't he be bellyaching? couldn't we be bellyaching? couldn't you be bellyaching? couldn't they be bellyaching?
Perfect
couldn't I have bellyached? couldn't you have bellyached? couldn't he have bellyached? couldn't we have bellyached? couldn't you have bellyached? couldn't they have bellyached?
V-ing perfect
couldn't I have been bellyaching? couldn't you have been bellyaching? couldn't he have been bellyaching? couldn't we have been bellyaching? couldn't you have been bellyaching? couldn't they have been bellyaching?