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