could shortwave
Verbo regular: shortwave - shortwaved- shortwaved

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could shortwave
you could shortwave
she could shortwave
we could shortwave
you could shortwave
they could shortwave 	I could be shortwaving
you could be shortwaving
she could be shortwaving
we could be shortwaving
you could be shortwaving
they could be shortwaving	I could have shortwaved
you could have shortwaved
she could have shortwaved
we could have shortwaved
you could have shortwaved
they could have shortwaved	I could have been shortwaving
you could have been shortwaving
she could have been shortwaving
we could have been shortwaving
you could have been shortwaving
they could have been shortwaving	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not shortwave
you could not shortwave
she could not shortwave
we could not shortwave
you could not shortwave
they could not shortwave 	I could not be shortwaving
you could not be shortwaving
she could not be shortwaving
we could not be shortwaving
you could not be shortwaving
they could not be shortwaving	I could not have shortwaved
you could not have shortwaved
she could not have shortwaved
we could not have shortwaved
you could not have shortwaved
they could not have shortwaved	I could not have been shortwaving
you could not have been shortwaving
she could not have been shortwaving
we could not have been shortwaving
you could not have been shortwaving
they could not have been shortwaving	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I shortwave?
could you shortwave?
could she shortwave?
could we shortwave?
could you shortwave?
could they shortwave? 	could I be shortwaving?
could you be shortwaving?
could she be shortwaving?
could we be shortwaving?
could you be shortwaving?
could they be shortwaving? 	could I have shortwaved?
could you have shortwaved?
could she have shortwaved?
could we have shortwaved?
could you have shortwaved?
could they have shortwaved? 	could I have been shortwaving?
could you have been shortwaving?
could she have been shortwaving?
could we have been shortwaving?
could you have been shortwaving?
could they have been shortwaving? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not shortwave?
could you not shortwave?
could she not shortwave?
could we not shortwave?
could you not shortwave?
could they not shortwave? 	could I not be shortwaving?
could you not be shortwaving?
could she not be shortwaving?
could we not be shortwaving?
could you not be shortwaving?
could they not be shortwaving? 	could I not have shortwaved?
could you not have shortwaved?
could she not have shortwaved?
could we not have shortwaved?
could you not have shortwaved?
could they not have shortwaved? 	could I not have been shortwaving?
could you not have been shortwaving?
could she not have been shortwaving?
could we not have been shortwaving?
could you not have been shortwaving?
could they not have been shortwaving?