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 could not spiff
you could not spiff
he could not spiff
we could not spiff
you could not spiff
they could not spiff 	I could not be spiffing
you could not be spiffing
he could not be spiffing
we could not be spiffing
you could not be spiffing
they could not be spiffing	I could not have spiffed
you could not have spiffed
he could not have spiffed
we could not have spiffed
you could not have spiffed
they could not have spiffed	I could not have been spiffing
you could not have been spiffing
he could not have been spiffing
we could not have been spiffing
you could not have been spiffing
they could not 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 	
could I not spiff?
could you not spiff?
could he not spiff?
could we not spiff?
could you not spiff?
could they not spiff? 	could I not be spiffing?
could you not be spiffing?
could he not be spiffing?
could we not be spiffing?
could you not be spiffing?
could they not be spiffing? 	could I not have spiffed?
could you not have spiffed?
could he not have spiffed?
could we not have spiffed?
could you not have spiffed?
could they not have spiffed? 	could I not have been spiffing?
could you not have been spiffing?
could he not have been spiffing?
could we not have been spiffing?
could you not have been spiffing?
could they not have been spiffing?