could scoff
Regular verb: scoff - scoffed- scoffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could scoff
you could scoff
she could scoff
we could scoff
you could scoff
they could scoff 	I could be scoffing
you could be scoffing
she could be scoffing
we could be scoffing
you could be scoffing
they could be scoffing	I could have scoffed
you could have scoffed
she could have scoffed
we could have scoffed
you could have scoffed
they could have scoffed	I could have been scoffing
you could have been scoffing
she could have been scoffing
we could have been scoffing
you could have been scoffing
they could have been scoffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not scoff
you could not scoff
she could not scoff
we could not scoff
you could not scoff
they could not scoff 	I could not be scoffing
you could not be scoffing
she could not be scoffing
we could not be scoffing
you could not be scoffing
they could not be scoffing	I could not have scoffed
you could not have scoffed
she could not have scoffed
we could not have scoffed
you could not have scoffed
they could not have scoffed	I could not have been scoffing
you could not have been scoffing
she could not have been scoffing
we could not have been scoffing
you could not have been scoffing
they could not have been scoffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I scoff?
could you scoff?
could she scoff?
could we scoff?
could you scoff?
could they scoff? 	could I be scoffing?
could you be scoffing?
could she be scoffing?
could we be scoffing?
could you be scoffing?
could they be scoffing? 	could I have scoffed?
could you have scoffed?
could she have scoffed?
could we have scoffed?
could you have scoffed?
could they have scoffed? 	could I have been scoffing?
could you have been scoffing?
could she have been scoffing?
could we have been scoffing?
could you have been scoffing?
could they have been scoffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not scoff?
could you not scoff?
could she not scoff?
could we not scoff?
could you not scoff?
could they not scoff? 	could I not be scoffing?
could you not be scoffing?
could she not be scoffing?
could we not be scoffing?
could you not be scoffing?
could they not be scoffing? 	could I not have scoffed?
could you not have scoffed?
could she not have scoffed?
could we not have scoffed?
could you not have scoffed?
could they not have scoffed? 	could I not have been scoffing?
could you not have been scoffing?
could she not have been scoffing?
could we not have been scoffing?
could you not have been scoffing?
could they not have been scoffing?