must rubberstamp
Regular verb: rubberstamp - rubberstamped- rubberstamped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must rubberstamp
you must rubberstamp
she must rubberstamp
we must rubberstamp
you must rubberstamp
they must rubberstamp 	I must be rubberstamping
you must be rubberstamping
she must be rubberstamping
we must be rubberstamping
you must be rubberstamping
they must be rubberstamping	I must have rubberstamped
you must have rubberstamped
she must have rubberstamped
we must have rubberstamped
you must have rubberstamped
they must have rubberstamped	I must have been rubberstamping
you must have been rubberstamping
she must have been rubberstamping
we must have been rubberstamping
you must have been rubberstamping
they must have been rubberstamping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't rubberstamp
you mustn't rubberstamp
she mustn't rubberstamp
we mustn't rubberstamp
you mustn't rubberstamp
they mustn't rubberstamp 	I mustn't be rubberstamping
you mustn't be rubberstamping
she mustn't be rubberstamping
we mustn't be rubberstamping
you mustn't be rubberstamping
they mustn't be rubberstamping	I mustn't have rubberstamped
you mustn't have rubberstamped
she mustn't have rubberstamped
we mustn't have rubberstamped
you mustn't have rubberstamped
they mustn't have rubberstamped	I mustn't have been rubberstamping
you mustn't have been rubberstamping
she mustn't have been rubberstamping
we mustn't have been rubberstamping
you mustn't have been rubberstamping
they mustn't have been rubberstamping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I rubberstamp?
must you rubberstamp?
must she rubberstamp?
must we rubberstamp?
must you rubberstamp?
must they rubberstamp? 	must I be rubberstamping?
must you be rubberstamping?
must she be rubberstamping?
must we be rubberstamping?
must you be rubberstamping?
must they be rubberstamping? 	must I have rubberstamped?
must you have rubberstamped?
must she have rubberstamped?
must we have rubberstamped?
must you have rubberstamped?
must they have rubberstamped? 	must I have been rubberstamping?
must you have been rubberstamping?
must she have been rubberstamping?
must we have been rubberstamping?
must you have been rubberstamping?
must they have been rubberstamping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I rubberstamp?
mustn't you rubberstamp?
mustn't she rubberstamp?
mustn't we rubberstamp?
mustn't you rubberstamp?
mustn't they rubberstamp? 	mustn't I be rubberstamping?
mustn't you be rubberstamping?
mustn't she be rubberstamping?
mustn't we be rubberstamping?
mustn't you be rubberstamping?
mustn't they be rubberstamping? 	mustn't I have rubberstamped?
mustn't you have rubberstamped?
mustn't she have rubberstamped?
mustn't we have rubberstamped?
mustn't you have rubberstamped?
mustn't they have rubberstamped? 	mustn't I have been rubberstamping?
mustn't you have been rubberstamping?
mustn't she have been rubberstamping?
mustn't we have been rubberstamping?
mustn't you have been rubberstamping?
mustn't they have been rubberstamping?