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