could spiff
Regular verb: spiff - spiffed- spiffed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could spiff
you could spiff
he could spiff
we could spiff
you could spiff
they could spiff 	I could be spiffing
you could be spiffing
he could be spiffing
we could be spiffing
you could be spiffing
they could be spiffing	I could have spiffed
you could have spiffed
he could have spiffed
we could have spiffed
you could have spiffed
they could have spiffed	I could have been spiffing
you could have been spiffing
he could have been spiffing
we could have been spiffing
you could have been spiffing
they could have been spiffing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't spiff
you couldn't spiff
he couldn't spiff
we couldn't spiff
you couldn't spiff
they couldn't spiff 	I couldn't be spiffing
you couldn't be spiffing
he couldn't be spiffing
we couldn't be spiffing
you couldn't be spiffing
they couldn't be spiffing	I couldn't have spiffed
you couldn't have spiffed
he couldn't have spiffed
we couldn't have spiffed
you couldn't have spiffed
they couldn't have spiffed	I couldn't have been spiffing
you couldn't have been spiffing
he couldn't have been spiffing
we couldn't have been spiffing
you couldn't have been spiffing
they couldn't have been spiffing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I spiff?
could you spiff?
could he spiff?
could we spiff?
could you spiff?
could they spiff? 	could I be spiffing?
could you be spiffing?
could he be spiffing?
could we be spiffing?
could you be spiffing?
could they be spiffing? 	could I have spiffed?
could you have spiffed?
could he have spiffed?
could we have spiffed?
could you have spiffed?
could they have spiffed? 	could I have been spiffing?
could you have been spiffing?
could he have been spiffing?
could we have been spiffing?
could you have been spiffing?
could they have been spiffing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I spiff?
couldn't you spiff?
couldn't he spiff?
couldn't we spiff?
couldn't you spiff?
couldn't they spiff? 	couldn't I be spiffing?
couldn't you be spiffing?
couldn't he be spiffing?
couldn't we be spiffing?
couldn't you be spiffing?
couldn't they be spiffing? 	couldn't I have spiffed?
couldn't you have spiffed?
couldn't he have spiffed?
couldn't we have spiffed?
couldn't you have spiffed?
couldn't they have spiffed? 	couldn't I have been spiffing?
couldn't you have been spiffing?
couldn't he have been spiffing?
couldn't we have been spiffing?
couldn't you have been spiffing?
couldn't they have been spiffing?