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 must not subdivide
you must not subdivide
she must not subdivide
we must not subdivide
you must not subdivide
they must not subdivide 	I must not be subdividing
you must not be subdividing
she must not be subdividing
we must not be subdividing
you must not be subdividing
they must not be subdividing	I must not have subdivided
you must not have subdivided
she must not have subdivided
we must not have subdivided
you must not have subdivided
they must not have subdivided	I must not have been subdividing
you must not have been subdividing
she must not have been subdividing
we must not have been subdividing
you must not have been subdividing
they must not 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 	
must I not subdivide?
must you not subdivide?
must she not subdivide?
must we not subdivide?
must you not subdivide?
must they not subdivide? 	must I not be subdividing?
must you not be subdividing?
must she not be subdividing?
must we not be subdividing?
must you not be subdividing?
must they not be subdividing? 	must I not have subdivided?
must you not have subdivided?
must she not have subdivided?
must we not have subdivided?
must you not have subdivided?
must they not have subdivided? 	must I not have been subdividing?
must you not have been subdividing?
must she not have been subdividing?
must we not have been subdividing?
must you not have been subdividing?
must they not have been subdividing?