must ruck
Regular verb: ruck - rucked- rucked

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must ruck
you must ruck
he must ruck
we must ruck
you must ruck
they must ruck 	I must be rucking
you must be rucking
he must be rucking
we must be rucking
you must be rucking
they must be rucking	I must have rucked
you must have rucked
he must have rucked
we must have rucked
you must have rucked
they must have rucked	I must have been rucking
you must have been rucking
he must have been rucking
we must have been rucking
you must have been rucking
they must have been rucking	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I mustn't ruck
you mustn't ruck
he mustn't ruck
we mustn't ruck
you mustn't ruck
they mustn't ruck 	I mustn't be rucking
you mustn't be rucking
he mustn't be rucking
we mustn't be rucking
you mustn't be rucking
they mustn't be rucking	I mustn't have rucked
you mustn't have rucked
he mustn't have rucked
we mustn't have rucked
you mustn't have rucked
they mustn't have rucked	I mustn't have been rucking
you mustn't have been rucking
he mustn't have been rucking
we mustn't have been rucking
you mustn't have been rucking
they mustn't have been rucking	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I ruck?
must you ruck?
must he ruck?
must we ruck?
must you ruck?
must they ruck? 	must I be rucking?
must you be rucking?
must he be rucking?
must we be rucking?
must you be rucking?
must they be rucking? 	must I have rucked?
must you have rucked?
must he have rucked?
must we have rucked?
must you have rucked?
must they have rucked? 	must I have been rucking?
must you have been rucking?
must he have been rucking?
must we have been rucking?
must you have been rucking?
must they have been rucking? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
mustn't I ruck?
mustn't you ruck?
mustn't he ruck?
mustn't we ruck?
mustn't you ruck?
mustn't they ruck? 	mustn't I be rucking?
mustn't you be rucking?
mustn't he be rucking?
mustn't we be rucking?
mustn't you be rucking?
mustn't they be rucking? 	mustn't I have rucked?
mustn't you have rucked?
mustn't he have rucked?
mustn't we have rucked?
mustn't you have rucked?
mustn't they have rucked? 	mustn't I have been rucking?
mustn't you have been rucking?
mustn't he have been rucking?
mustn't we have been rucking?
mustn't you have been rucking?
mustn't they have been rucking?