I could bulk you could bulk she could bulk we could bulk you could bulk they could bulk
V-ing form
I could be bulking you could be bulking she could be bulking we could be bulking you could be bulking they could be bulking
Perfect
I could have bulked you could have bulked she could have bulked we could have bulked you could have bulked they could have bulked
V-ing perfect
I could have been bulking you could have been bulking she could have been bulking we could have been bulking you could have been bulking they could have been bulking
Negation
Simple form
I could not bulk you could not bulk she could not bulk we could not bulk you could not bulk they could not bulk
V-ing form
I could not be bulking you could not be bulking she could not be bulking we could not be bulking you could not be bulking they could not be bulking
Perfect
I could not have bulked you could not have bulked she could not have bulked we could not have bulked you could not have bulked they could not have bulked
V-ing perfect
I could not have been bulking you could not have been bulking she could not have been bulking we could not have been bulking you could not have been bulking they could not have been bulking
Interrogative form
Simple form
could I bulk? could you bulk? could she bulk? could we bulk? could you bulk? could they bulk?
V-ing form
could I be bulking? could you be bulking? could she be bulking? could we be bulking? could you be bulking? could they be bulking?
Perfect
could I have bulked? could you have bulked? could she have bulked? could we have bulked? could you have bulked? could they have bulked?
V-ing perfect
could I have been bulking? could you have been bulking? could she have been bulking? could we have been bulking? could you have been bulking? could they have been bulking?
Interro-negative form
Simple form
could I not bulk? could you not bulk? could she not bulk? could we not bulk? could you not bulk? could they not bulk?
V-ing form
could I not be bulking? could you not be bulking? could she not be bulking? could we not be bulking? could you not be bulking? could they not be bulking?
Perfect
could I not have bulked? could you not have bulked? could she not have bulked? could we not have bulked? could you not have bulked? could they not have bulked?
V-ing perfect
could I not have been bulking? could you not have been bulking? could she not have been bulking? could we not have been bulking? could you not have been bulking? could they not have been bulking?