could retune
Verbo regular: retune - retuned- retuned

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could retune
you could retune
he could retune
we could retune
you could retune
they could retune 	I could be retuning
you could be retuning
he could be retuning
we could be retuning
you could be retuning
they could be retuning	I could have retuned
you could have retuned
he could have retuned
we could have retuned
you could have retuned
they could have retuned	I could have been retuning
you could have been retuning
he could have been retuning
we could have been retuning
you could have been retuning
they could have been retuning	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't retune
you couldn't retune
he couldn't retune
we couldn't retune
you couldn't retune
they couldn't retune 	I couldn't be retuning
you couldn't be retuning
he couldn't be retuning
we couldn't be retuning
you couldn't be retuning
they couldn't be retuning	I couldn't have retuned
you couldn't have retuned
he couldn't have retuned
we couldn't have retuned
you couldn't have retuned
they couldn't have retuned	I couldn't have been retuning
you couldn't have been retuning
he couldn't have been retuning
we couldn't have been retuning
you couldn't have been retuning
they couldn't have been retuning	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I retune?
could you retune?
could he retune?
could we retune?
could you retune?
could they retune? 	could I be retuning?
could you be retuning?
could he be retuning?
could we be retuning?
could you be retuning?
could they be retuning? 	could I have retuned?
could you have retuned?
could he have retuned?
could we have retuned?
could you have retuned?
could they have retuned? 	could I have been retuning?
could you have been retuning?
could he have been retuning?
could we have been retuning?
could you have been retuning?
could they have been retuning? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I retune?
couldn't you retune?
couldn't he retune?
couldn't we retune?
couldn't you retune?
couldn't they retune? 	couldn't I be retuning?
couldn't you be retuning?
couldn't he be retuning?
couldn't we be retuning?
couldn't you be retuning?
couldn't they be retuning? 	couldn't I have retuned?
couldn't you have retuned?
couldn't he have retuned?
couldn't we have retuned?
couldn't you have retuned?
couldn't they have retuned? 	couldn't I have been retuning?
couldn't you have been retuning?
couldn't he have been retuning?
couldn't we have been retuning?
couldn't you have been retuning?
couldn't they have been retuning?