I could bellow you could bellow she could bellow we could bellow you could bellow they could bellow
V-ing form
I could be bellowing you could be bellowing she could be bellowing we could be bellowing you could be bellowing they could be bellowing
Perfect
I could have bellowed you could have bellowed she could have bellowed we could have bellowed you could have bellowed they could have bellowed
V-ing perfect
I could have been bellowing you could have been bellowing she could have been bellowing we could have been bellowing you could have been bellowing they could have been bellowing
Negation
Simple form
I couldn't bellow you couldn't bellow she couldn't bellow we couldn't bellow you couldn't bellow they couldn't bellow
V-ing form
I couldn't be bellowing you couldn't be bellowing she couldn't be bellowing we couldn't be bellowing you couldn't be bellowing they couldn't be bellowing
Perfect
I couldn't have bellowed you couldn't have bellowed she couldn't have bellowed we couldn't have bellowed you couldn't have bellowed they couldn't have bellowed
V-ing perfect
I couldn't have been bellowing you couldn't have been bellowing she couldn't have been bellowing we couldn't have been bellowing you couldn't have been bellowing they couldn't have been bellowing
Interrogative form
Simple form
could I bellow? could you bellow? could she bellow? could we bellow? could you bellow? could they bellow?
V-ing form
could I be bellowing? could you be bellowing? could she be bellowing? could we be bellowing? could you be bellowing? could they be bellowing?
Perfect
could I have bellowed? could you have bellowed? could she have bellowed? could we have bellowed? could you have bellowed? could they have bellowed?
V-ing perfect
could I have been bellowing? could you have been bellowing? could she have been bellowing? could we have been bellowing? could you have been bellowing? could they have been bellowing?
Interro-negative form
Simple form
couldn't I bellow? couldn't you bellow? couldn't she bellow? couldn't we bellow? couldn't you bellow? couldn't they bellow?
V-ing form
couldn't I be bellowing? couldn't you be bellowing? couldn't she be bellowing? couldn't we be bellowing? couldn't you be bellowing? couldn't they be bellowing?
Perfect
couldn't I have bellowed? couldn't you have bellowed? couldn't she have bellowed? couldn't we have bellowed? couldn't you have bellowed? couldn't they have bellowed?
V-ing perfect
couldn't I have been bellowing? couldn't you have been bellowing? couldn't she have been bellowing? couldn't we have been bellowing? couldn't you have been bellowing? couldn't they have been bellowing?