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 must not pucker
you must not pucker
he must not pucker
we must not pucker
you must not pucker
they must not pucker 	I must not be puckering
you must not be puckering
he must not be puckering
we must not be puckering
you must not be puckering
they must not be puckering	I must not have puckered
you must not have puckered
he must not have puckered
we must not have puckered
you must not have puckered
they must not have puckered	I must not have been puckering
you must not have been puckering
he must not have been puckering
we must not have been puckering
you must not have been puckering
they must not 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 	
must I not pucker?
must you not pucker?
must he not pucker?
must we not pucker?
must you not pucker?
must they not pucker? 	must I not be puckering?
must you not be puckering?
must he not be puckering?
must we not be puckering?
must you not be puckering?
must they not be puckering? 	must I not have puckered?
must you not have puckered?
must he not have puckered?
must we not have puckered?
must you not have puckered?
must they not have puckered? 	must I not have been puckering?
must you not have been puckering?
must he not have been puckering?
must we not have been puckering?
must you not have been puckering?
must they not have been puckering?