could yowl
Verbo regular: yowl - yowled- yowled

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could yowl
you could yowl
he could yowl
we could yowl
you could yowl
they could yowl 	I could be yowling
you could be yowling
he could be yowling
we could be yowling
you could be yowling
they could be yowling	I could have yowled
you could have yowled
he could have yowled
we could have yowled
you could have yowled
they could have yowled	I could have been yowling
you could have been yowling
he could have been yowling
we could have been yowling
you could have been yowling
they could have been yowling	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not yowl
you could not yowl
he could not yowl
we could not yowl
you could not yowl
they could not yowl 	I could not be yowling
you could not be yowling
he could not be yowling
we could not be yowling
you could not be yowling
they could not be yowling	I could not have yowled
you could not have yowled
he could not have yowled
we could not have yowled
you could not have yowled
they could not have yowled	I could not have been yowling
you could not have been yowling
he could not have been yowling
we could not have been yowling
you could not have been yowling
they could not have been yowling	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I yowl?
could you yowl?
could he yowl?
could we yowl?
could you yowl?
could they yowl? 	could I be yowling?
could you be yowling?
could he be yowling?
could we be yowling?
could you be yowling?
could they be yowling? 	could I have yowled?
could you have yowled?
could he have yowled?
could we have yowled?
could you have yowled?
could they have yowled? 	could I have been yowling?
could you have been yowling?
could he have been yowling?
could we have been yowling?
could you have been yowling?
could they have been yowling? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not yowl?
could you not yowl?
could he not yowl?
could we not yowl?
could you not yowl?
could they not yowl? 	could I not be yowling?
could you not be yowling?
could he not be yowling?
could we not be yowling?
could you not be yowling?
could they not be yowling? 	could I not have yowled?
could you not have yowled?
could he not have yowled?
could we not have yowled?
could you not have yowled?
could they not have yowled? 	could I not have been yowling?
could you not have been yowling?
could he not have been yowling?
could we not have been yowling?
could you not have been yowling?
could they not have been yowling?