could whiff
Verbo regular: whiff - whiffed- whiffed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could whiff
you could whiff
he could whiff
we could whiff
you could whiff
they could whiff 	I could be whiffing
you could be whiffing
he could be whiffing
we could be whiffing
you could be whiffing
they could be whiffing	I could have whiffed
you could have whiffed
he could have whiffed
we could have whiffed
you could have whiffed
they could have whiffed	I could have been whiffing
you could have been whiffing
he could have been whiffing
we could have been whiffing
you could have been whiffing
they could have been whiffing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not whiff
you could not whiff
he could not whiff
we could not whiff
you could not whiff
they could not whiff 	I could not be whiffing
you could not be whiffing
he could not be whiffing
we could not be whiffing
you could not be whiffing
they could not be whiffing	I could not have whiffed
you could not have whiffed
he could not have whiffed
we could not have whiffed
you could not have whiffed
they could not have whiffed	I could not have been whiffing
you could not have been whiffing
he could not have been whiffing
we could not have been whiffing
you could not have been whiffing
they could not have been whiffing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I whiff?
could you whiff?
could he whiff?
could we whiff?
could you whiff?
could they whiff? 	could I be whiffing?
could you be whiffing?
could he be whiffing?
could we be whiffing?
could you be whiffing?
could they be whiffing? 	could I have whiffed?
could you have whiffed?
could he have whiffed?
could we have whiffed?
could you have whiffed?
could they have whiffed? 	could I have been whiffing?
could you have been whiffing?
could he have been whiffing?
could we have been whiffing?
could you have been whiffing?
could they have been whiffing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not whiff?
could you not whiff?
could he not whiff?
could we not whiff?
could you not whiff?
could they not whiff? 	could I not be whiffing?
could you not be whiffing?
could he not be whiffing?
could we not be whiffing?
could you not be whiffing?
could they not be whiffing? 	could I not have whiffed?
could you not have whiffed?
could he not have whiffed?
could we not have whiffed?
could you not have whiffed?
could they not have whiffed? 	could I not have been whiffing?
could you not have been whiffing?
could he not have been whiffing?
could we not have been whiffing?
could you not have been whiffing?
could they not have been whiffing?