must sucker
Regular verb: sucker - suckered- suckered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must sucker
you must sucker
she must sucker
we must sucker
you must sucker
they must sucker 	I must be suckering
you must be suckering
she must be suckering
we must be suckering
you must be suckering
they must be suckering	I must have suckered
you must have suckered
she must have suckered
we must have suckered
you must have suckered
they must have suckered	I must have been suckering
you must have been suckering
she must have been suckering
we must have been suckering
you must have been suckering
they must have been suckering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't sucker
you mustn't sucker
she mustn't sucker
we mustn't sucker
you mustn't sucker
they mustn't sucker 	I mustn't be suckering
you mustn't be suckering
she mustn't be suckering
we mustn't be suckering
you mustn't be suckering
they mustn't be suckering	I mustn't have suckered
you mustn't have suckered
she mustn't have suckered
we mustn't have suckered
you mustn't have suckered
they mustn't have suckered	I mustn't have been suckering
you mustn't have been suckering
she mustn't have been suckering
we mustn't have been suckering
you mustn't have been suckering
they mustn't have been suckering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I sucker?
must you sucker?
must she sucker?
must we sucker?
must you sucker?
must they sucker? 	must I be suckering?
must you be suckering?
must she be suckering?
must we be suckering?
must you be suckering?
must they be suckering? 	must I have suckered?
must you have suckered?
must she have suckered?
must we have suckered?
must you have suckered?
must they have suckered? 	must I have been suckering?
must you have been suckering?
must she have been suckering?
must we have been suckering?
must you have been suckering?
must they have been suckering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I sucker?
mustn't you sucker?
mustn't she sucker?
mustn't we sucker?
mustn't you sucker?
mustn't they sucker? 	mustn't I be suckering?
mustn't you be suckering?
mustn't she be suckering?
mustn't we be suckering?
mustn't you be suckering?
mustn't they be suckering? 	mustn't I have suckered?
mustn't you have suckered?
mustn't she have suckered?
mustn't we have suckered?
mustn't you have suckered?
mustn't they have suckered? 	mustn't I have been suckering?
mustn't you have been suckering?
mustn't she have been suckering?
mustn't we have been suckering?
mustn't you have been suckering?
mustn't they have been suckering?