must dicker
Regular verb: dicker - dickered- dickered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must dicker
you must dicker
he must dicker
we must dicker
you must dicker
they must dicker 	I must be dickering
you must be dickering
he must be dickering
we must be dickering
you must be dickering
they must be dickering	I must have dickered
you must have dickered
he must have dickered
we must have dickered
you must have dickered
they must have dickered	I must have been dickering
you must have been dickering
he must have been dickering
we must have been dickering
you must have been dickering
they must have been dickering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't dicker
you mustn't dicker
he mustn't dicker
we mustn't dicker
you mustn't dicker
they mustn't dicker 	I mustn't be dickering
you mustn't be dickering
he mustn't be dickering
we mustn't be dickering
you mustn't be dickering
they mustn't be dickering	I mustn't have dickered
you mustn't have dickered
he mustn't have dickered
we mustn't have dickered
you mustn't have dickered
they mustn't have dickered	I mustn't have been dickering
you mustn't have been dickering
he mustn't have been dickering
we mustn't have been dickering
you mustn't have been dickering
they mustn't have been dickering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I dicker?
must you dicker?
must he dicker?
must we dicker?
must you dicker?
must they dicker? 	must I be dickering?
must you be dickering?
must he be dickering?
must we be dickering?
must you be dickering?
must they be dickering? 	must I have dickered?
must you have dickered?
must he have dickered?
must we have dickered?
must you have dickered?
must they have dickered? 	must I have been dickering?
must you have been dickering?
must he have been dickering?
must we have been dickering?
must you have been dickering?
must they have been dickering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I dicker?
mustn't you dicker?
mustn't he dicker?
mustn't we dicker?
mustn't you dicker?
mustn't they dicker? 	mustn't I be dickering?
mustn't you be dickering?
mustn't he be dickering?
mustn't we be dickering?
mustn't you be dickering?
mustn't they be dickering? 	mustn't I have dickered?
mustn't you have dickered?
mustn't he have dickered?
mustn't we have dickered?
mustn't you have dickered?
mustn't they have dickered? 	mustn't I have been dickering?
mustn't you have been dickering?
mustn't he have been dickering?
mustn't we have been dickering?
mustn't you have been dickering?
mustn't they have been dickering?