could canker
Verbo regular: canker - cankered- cankered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could canker
you could canker
he could canker
we could canker
you could canker
they could canker 	I could be cankering
you could be cankering
he could be cankering
we could be cankering
you could be cankering
they could be cankering	I could have cankered
you could have cankered
he could have cankered
we could have cankered
you could have cankered
they could have cankered	I could have been cankering
you could have been cankering
he could have been cankering
we could have been cankering
you could have been cankering
they could have been cankering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not canker
you could not canker
he could not canker
we could not canker
you could not canker
they could not canker 	I could not be cankering
you could not be cankering
he could not be cankering
we could not be cankering
you could not be cankering
they could not be cankering	I could not have cankered
you could not have cankered
he could not have cankered
we could not have cankered
you could not have cankered
they could not have cankered	I could not have been cankering
you could not have been cankering
he could not have been cankering
we could not have been cankering
you could not have been cankering
they could not have been cankering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I canker?
could you canker?
could he canker?
could we canker?
could you canker?
could they canker? 	could I be cankering?
could you be cankering?
could he be cankering?
could we be cankering?
could you be cankering?
could they be cankering? 	could I have cankered?
could you have cankered?
could he have cankered?
could we have cankered?
could you have cankered?
could they have cankered? 	could I have been cankering?
could you have been cankering?
could he have been cankering?
could we have been cankering?
could you have been cankering?
could they have been cankering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not canker?
could you not canker?
could he not canker?
could we not canker?
could you not canker?
could they not canker? 	could I not be cankering?
could you not be cankering?
could he not be cankering?
could we not be cankering?
could you not be cankering?
could they not be cankering? 	could I not have cankered?
could you not have cankered?
could he not have cankered?
could we not have cankered?
could you not have cankered?
could they not have cankered? 	could I not have been cankering?
could you not have been cankering?
could he not have been cankering?
could we not have been cankering?
could you not have been cankering?
could they not have been cankering?