must rubber-stamp
Regular verb: rubber-stamp - rubber-stamped- rubber-stamped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must rubber-stamp
you must rubber-stamp
he must rubber-stamp
we must rubber-stamp
you must rubber-stamp
they must rubber-stamp 	I must be rubber-stamping
you must be rubber-stamping
he must be rubber-stamping
we must be rubber-stamping
you must be rubber-stamping
they must be rubber-stamping	I must have rubber-stamped
you must have rubber-stamped
he must have rubber-stamped
we must have rubber-stamped
you must have rubber-stamped
they must have rubber-stamped	I must have been rubber-stamping
you must have been rubber-stamping
he must have been rubber-stamping
we must have been rubber-stamping
you must have been rubber-stamping
they must have been rubber-stamping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't rubber-stamp
you mustn't rubber-stamp
he mustn't rubber-stamp
we mustn't rubber-stamp
you mustn't rubber-stamp
they mustn't rubber-stamp 	I mustn't be rubber-stamping
you mustn't be rubber-stamping
he mustn't be rubber-stamping
we mustn't be rubber-stamping
you mustn't be rubber-stamping
they mustn't be rubber-stamping	I mustn't have rubber-stamped
you mustn't have rubber-stamped
he mustn't have rubber-stamped
we mustn't have rubber-stamped
you mustn't have rubber-stamped
they mustn't have rubber-stamped	I mustn't have been rubber-stamping
you mustn't have been rubber-stamping
he mustn't have been rubber-stamping
we mustn't have been rubber-stamping
you mustn't have been rubber-stamping
they mustn't have been rubber-stamping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I rubber-stamp?
must you rubber-stamp?
must he rubber-stamp?
must we rubber-stamp?
must you rubber-stamp?
must they rubber-stamp? 	must I be rubber-stamping?
must you be rubber-stamping?
must he be rubber-stamping?
must we be rubber-stamping?
must you be rubber-stamping?
must they be rubber-stamping? 	must I have rubber-stamped?
must you have rubber-stamped?
must he have rubber-stamped?
must we have rubber-stamped?
must you have rubber-stamped?
must they have rubber-stamped? 	must I have been rubber-stamping?
must you have been rubber-stamping?
must he have been rubber-stamping?
must we have been rubber-stamping?
must you have been rubber-stamping?
must they have been rubber-stamping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I rubber-stamp?
mustn't you rubber-stamp?
mustn't he rubber-stamp?
mustn't we rubber-stamp?
mustn't you rubber-stamp?
mustn't they rubber-stamp? 	mustn't I be rubber-stamping?
mustn't you be rubber-stamping?
mustn't he be rubber-stamping?
mustn't we be rubber-stamping?
mustn't you be rubber-stamping?
mustn't they be rubber-stamping? 	mustn't I have rubber-stamped?
mustn't you have rubber-stamped?
mustn't he have rubber-stamped?
mustn't we have rubber-stamped?
mustn't you have rubber-stamped?
mustn't they have rubber-stamped? 	mustn't I have been rubber-stamping?
mustn't you have been rubber-stamping?
mustn't he have been rubber-stamping?
mustn't we have been rubber-stamping?
mustn't you have been rubber-stamping?
mustn't they have been rubber-stamping?