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 cannot roister
you cannot roister
he cannot roister
we cannot roister
you cannot roister
they cannot roister 	I cannot be roistering
you cannot be roistering
he cannot be roistering
we cannot be roistering
you cannot be roistering
they cannot be roistering	I cannot have roistered
you cannot have roistered
he cannot have roistered
we cannot have roistered
you cannot have roistered
they cannot have roistered	I cannot have been roistering
you cannot have been roistering
he cannot have been roistering
we cannot have been roistering
you cannot have been roistering
they cannot 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 I not roister?
can you not roister?
can he not roister?
can we not roister?
can you not roister?
can they not roister? 	can I not be roistering?
can you not be roistering?
can he not be roistering?
can we not be roistering?
can you not be roistering?
can they not be roistering? 	can I not have roistered?
can you not have roistered?
can he not have roistered?
can we not have roistered?
can you not have roistered?
can they not have roistered? 	can I not have been roistering?
can you not have been roistering?
can he not have been roistering?
can we not have been roistering?
can you not have been roistering?
can they not have been roistering?