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 could not bellow you could not bellow she could not bellow we could not bellow you could not bellow they could not bellow
V-ing form
I could not be bellowing you could not be bellowing she could not be bellowing we could not be bellowing you could not be bellowing they could not be bellowing
Perfect
I could not have bellowed you could not have bellowed she could not have bellowed we could not have bellowed you could not have bellowed they could not have bellowed
V-ing perfect
I could not have been bellowing you could not have been bellowing she could not have been bellowing we could not have been bellowing you could not have been bellowing they could not 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
could I not bellow? could you not bellow? could she not bellow? could we not bellow? could you not bellow? could they not bellow?
V-ing form
could I not be bellowing? could you not be bellowing? could she not be bellowing? could we not be bellowing? could you not be bellowing? could they not be bellowing?
Perfect
could I not have bellowed? could you not have bellowed? could she not have bellowed? could we not have bellowed? could you not have bellowed? could they not have bellowed?
V-ing perfect
could I not have been bellowing? could you not have been bellowing? could she not have been bellowing? could we not have been bellowing? could you not have been bellowing? could they not have been bellowing?