must prestamp
Regular verb: prestamp - prestamped- prestamped

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must prestamp
you must prestamp
he must prestamp
we must prestamp
you must prestamp
they must prestamp 	I must be prestamping
you must be prestamping
he must be prestamping
we must be prestamping
you must be prestamping
they must be prestamping	I must have prestamped
you must have prestamped
he must have prestamped
we must have prestamped
you must have prestamped
they must have prestamped	I must have been prestamping
you must have been prestamping
he must have been prestamping
we must have been prestamping
you must have been prestamping
they must have been prestamping	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not prestamp
you must not prestamp
he must not prestamp
we must not prestamp
you must not prestamp
they must not prestamp 	I must not be prestamping
you must not be prestamping
he must not be prestamping
we must not be prestamping
you must not be prestamping
they must not be prestamping	I must not have prestamped
you must not have prestamped
he must not have prestamped
we must not have prestamped
you must not have prestamped
they must not have prestamped	I must not have been prestamping
you must not have been prestamping
he must not have been prestamping
we must not have been prestamping
you must not have been prestamping
they must not have been prestamping	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I prestamp?
must you prestamp?
must he prestamp?
must we prestamp?
must you prestamp?
must they prestamp? 	must I be prestamping?
must you be prestamping?
must he be prestamping?
must we be prestamping?
must you be prestamping?
must they be prestamping? 	must I have prestamped?
must you have prestamped?
must he have prestamped?
must we have prestamped?
must you have prestamped?
must they have prestamped? 	must I have been prestamping?
must you have been prestamping?
must he have been prestamping?
must we have been prestamping?
must you have been prestamping?
must they have been prestamping? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not prestamp?
must you not prestamp?
must he not prestamp?
must we not prestamp?
must you not prestamp?
must they not prestamp? 	must I not be prestamping?
must you not be prestamping?
must he not be prestamping?
must we not be prestamping?
must you not be prestamping?
must they not be prestamping? 	must I not have prestamped?
must you not have prestamped?
must he not have prestamped?
must we not have prestamped?
must you not have prestamped?
must they not have prestamped? 	must I not have been prestamping?
must you not have been prestamping?
must he not have been prestamping?
must we not have been prestamping?
must you not have been prestamping?
must they not have been prestamping?