could preregister
Regular verb: preregister - preregistered- preregistered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could preregister
you could preregister
he could preregister
we could preregister
you could preregister
they could preregister 	I could be preregistering
you could be preregistering
he could be preregistering
we could be preregistering
you could be preregistering
they could be preregistering	I could have preregistered
you could have preregistered
he 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
he 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
he 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
he 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
he 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
he 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 he preregister?
could we preregister?
could you preregister?
could they preregister? 	could I be preregistering?
could you be preregistering?
could he be preregistering?
could we be preregistering?
could you be preregistering?
could they be preregistering? 	could I have preregistered?
could you have preregistered?
could he 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 he 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 he 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 he 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 he 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 he have been preregistering?
couldn't we have been preregistering?
couldn't you have been preregistering?
couldn't they have been preregistering?