can roister
Regular verb: roister - roistered- roistered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can roister
you can roister
he can roister
we can roister
you can roister
they can roister 	I can be roistering
you can be roistering
he can be roistering
we can be roistering
you can be roistering
they can be roistering	I can have roistered
you can have roistered
he can have roistered
we can have roistered
you can have roistered
they can have roistered	I can have been roistering
you can have been roistering
he can have been roistering
we can have been roistering
you can have been roistering
they can have been roistering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can't roister
you can't roister
he can't roister
we can't roister
you can't roister
they can't roister 	I can't be roistering
you can't be roistering
he can't be roistering
we can't be roistering
you can't be roistering
they can't be roistering	I can't have roistered
you can't have roistered
he can't have roistered
we can't have roistered
you can't have roistered
they can't have roistered	I can't have been roistering
you can't have been roistering
he can't have been roistering
we can't have been roistering
you can't have been roistering
they can't have been roistering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I roister?
can you roister?
can he roister?
can we roister?
can you roister?
can they roister? 	can I be roistering?
can you be roistering?
can he be roistering?
can we be roistering?
can you be roistering?
can they be roistering? 	can I have roistered?
can you have roistered?
can he have roistered?
can we have roistered?
can you have roistered?
can they have roistered? 	can I have been roistering?
can you have been roistering?
can he have been roistering?
can we have been roistering?
can you have been roistering?
can they have been roistering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can't I roister?
can't you roister?
can't he roister?
can't we roister?
can't you roister?
can't they roister? 	can't I be roistering?
can't you be roistering?
can't he be roistering?
can't we be roistering?
can't you be roistering?
can't they be roistering? 	can't I have roistered?
can't you have roistered?
can't he have roistered?
can't we have roistered?
can't you have roistered?
can't they have roistered? 	can't I have been roistering?
can't you have been roistering?
can't he have been roistering?
can't we have been roistering?
can't you have been roistering?
can't they have been roistering?