must pucker
Regular verb: pucker - puckered- puckered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must pucker
you must pucker
he must pucker
we must pucker
you must pucker
they must pucker 	I must be puckering
you must be puckering
he must be puckering
we must be puckering
you must be puckering
they must be puckering	I must have puckered
you must have puckered
he must have puckered
we must have puckered
you must have puckered
they must have puckered	I must have been puckering
you must have been puckering
he must have been puckering
we must have been puckering
you must have been puckering
they must have been puckering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't pucker
you mustn't pucker
he mustn't pucker
we mustn't pucker
you mustn't pucker
they mustn't pucker 	I mustn't be puckering
you mustn't be puckering
he mustn't be puckering
we mustn't be puckering
you mustn't be puckering
they mustn't be puckering	I mustn't have puckered
you mustn't have puckered
he mustn't have puckered
we mustn't have puckered
you mustn't have puckered
they mustn't have puckered	I mustn't have been puckering
you mustn't have been puckering
he mustn't have been puckering
we mustn't have been puckering
you mustn't have been puckering
they mustn't have been puckering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I pucker?
must you pucker?
must he pucker?
must we pucker?
must you pucker?
must they pucker? 	must I be puckering?
must you be puckering?
must he be puckering?
must we be puckering?
must you be puckering?
must they be puckering? 	must I have puckered?
must you have puckered?
must he have puckered?
must we have puckered?
must you have puckered?
must they have puckered? 	must I have been puckering?
must you have been puckering?
must he have been puckering?
must we have been puckering?
must you have been puckering?
must they have been puckering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I pucker?
mustn't you pucker?
mustn't he pucker?
mustn't we pucker?
mustn't you pucker?
mustn't they pucker? 	mustn't I be puckering?
mustn't you be puckering?
mustn't he be puckering?
mustn't we be puckering?
mustn't you be puckering?
mustn't they be puckering? 	mustn't I have puckered?
mustn't you have puckered?
mustn't he have puckered?
mustn't we have puckered?
mustn't you have puckered?
mustn't they have puckered? 	mustn't I have been puckering?
mustn't you have been puckering?
mustn't he have been puckering?
mustn't we have been puckering?
mustn't you have been puckering?
mustn't they have been puckering?