could green
Verbo regular: green - greened- greened

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could green
you could green
he could green
we could green
you could green
they could green 	I could be greening
you could be greening
he could be greening
we could be greening
you could be greening
they could be greening	I could have greened
you could have greened
he could have greened
we could have greened
you could have greened
they could have greened	I could have been greening
you could have been greening
he could have been greening
we could have been greening
you could have been greening
they could have been greening	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not green
you could not green
he could not green
we could not green
you could not green
they could not green 	I could not be greening
you could not be greening
he could not be greening
we could not be greening
you could not be greening
they could not be greening	I could not have greened
you could not have greened
he could not have greened
we could not have greened
you could not have greened
they could not have greened	I could not have been greening
you could not have been greening
he could not have been greening
we could not have been greening
you could not have been greening
they could not have been greening	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I green?
could you green?
could he green?
could we green?
could you green?
could they green? 	could I be greening?
could you be greening?
could he be greening?
could we be greening?
could you be greening?
could they be greening? 	could I have greened?
could you have greened?
could he have greened?
could we have greened?
could you have greened?
could they have greened? 	could I have been greening?
could you have been greening?
could he have been greening?
could we have been greening?
could you have been greening?
could they have been greening? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not green?
could you not green?
could he not green?
could we not green?
could you not green?
could they not green? 	could I not be greening?
could you not be greening?
could he not be greening?
could we not be greening?
could you not be greening?
could they not be greening? 	could I not have greened?
could you not have greened?
could he not have greened?
could we not have greened?
could you not have greened?
could they not have greened? 	could I not have been greening?
could you not have been greening?
could he not have been greening?
could we not have been greening?
could you not have been greening?
could they not have been greening?