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