could preregister
Regular verb: preregister - preregistered- preregistered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could preregister
you could preregister
she could preregister
we could preregister
you could preregister
they could preregister 	I could be preregistering
you could be preregistering
she could be preregistering
we could be preregistering
you could be preregistering
they could be preregistering	I could have preregistered
you could have preregistered
she could have preregistered
we could have preregistered
you could have preregistered
they could have preregistered	I could have been preregistering
you could have been preregistering
she could have been preregistering
we could have been preregistering
you could have been preregistering
they could have been preregistering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't preregister
you couldn't preregister
she couldn't preregister
we couldn't preregister
you couldn't preregister
they couldn't preregister 	I couldn't be preregistering
you couldn't be preregistering
she couldn't be preregistering
we couldn't be preregistering
you couldn't be preregistering
they couldn't be preregistering	I couldn't have preregistered
you couldn't have preregistered
she couldn't have preregistered
we couldn't have preregistered
you couldn't have preregistered
they couldn't have preregistered	I couldn't have been preregistering
you couldn't have been preregistering
she couldn't have been preregistering
we couldn't have been preregistering
you couldn't have been preregistering
they couldn't have been preregistering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I preregister?
could you preregister?
could she preregister?
could we preregister?
could you preregister?
could they preregister? 	could I be preregistering?
could you be preregistering?
could she be preregistering?
could we be preregistering?
could you be preregistering?
could they be preregistering? 	could I have preregistered?
could you have preregistered?
could she have preregistered?
could we have preregistered?
could you have preregistered?
could they have preregistered? 	could I have been preregistering?
could you have been preregistering?
could she have been preregistering?
could we have been preregistering?
could you have been preregistering?
could they have been preregistering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I preregister?
couldn't you preregister?
couldn't she preregister?
couldn't we preregister?
couldn't you preregister?
couldn't they preregister? 	couldn't I be preregistering?
couldn't you be preregistering?
couldn't she be preregistering?
couldn't we be preregistering?
couldn't you be preregistering?
couldn't they be preregistering? 	couldn't I have preregistered?
couldn't you have preregistered?
couldn't she have preregistered?
couldn't we have preregistered?
couldn't you have preregistered?
couldn't they have preregistered? 	couldn't I have been preregistering?
couldn't you have been preregistering?
couldn't she have been preregistering?
couldn't we have been preregistering?
couldn't you have been preregistering?
couldn't they have been preregistering?