must subdivide
Regular verb: subdivide - subdivided- subdivided

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must subdivide
you must subdivide
she must subdivide
we must subdivide
you must subdivide
they must subdivide 	I must be subdividing
you must be subdividing
she must be subdividing
we must be subdividing
you must be subdividing
they must be subdividing	I must have subdivided
you must have subdivided
she must have subdivided
we must have subdivided
you must have subdivided
they must have subdivided	I must have been subdividing
you must have been subdividing
she must have been subdividing
we must have been subdividing
you must have been subdividing
they must have been subdividing	

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

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