could stay
Verbo regular: stay - stayed- stayed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could stay
you could stay
he could stay
we could stay
you could stay
they could stay 	I could be staying
you could be staying
he could be staying
we could be staying
you could be staying
they could be staying	I could have stayed
you could have stayed
he could have stayed
we could have stayed
you could have stayed
they could have stayed	I could have been staying
you could have been staying
he could have been staying
we could have been staying
you could have been staying
they could have been staying	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't stay
you couldn't stay
he couldn't stay
we couldn't stay
you couldn't stay
they couldn't stay 	I couldn't be staying
you couldn't be staying
he couldn't be staying
we couldn't be staying
you couldn't be staying
they couldn't be staying	I couldn't have stayed
you couldn't have stayed
he couldn't have stayed
we couldn't have stayed
you couldn't have stayed
they couldn't have stayed	I couldn't have been staying
you couldn't have been staying
he couldn't have been staying
we couldn't have been staying
you couldn't have been staying
they couldn't have been staying	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I stay?
could you stay?
could he stay?
could we stay?
could you stay?
could they stay? 	could I be staying?
could you be staying?
could he be staying?
could we be staying?
could you be staying?
could they be staying? 	could I have stayed?
could you have stayed?
could he have stayed?
could we have stayed?
could you have stayed?
could they have stayed? 	could I have been staying?
could you have been staying?
could he have been staying?
could we have been staying?
could you have been staying?
could they have been staying? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I stay?
couldn't you stay?
couldn't he stay?
couldn't we stay?
couldn't you stay?
couldn't they stay? 	couldn't I be staying?
couldn't you be staying?
couldn't he be staying?
couldn't we be staying?
couldn't you be staying?
couldn't they be staying? 	couldn't I have stayed?
couldn't you have stayed?
couldn't he have stayed?
couldn't we have stayed?
couldn't you have stayed?
couldn't they have stayed? 	couldn't I have been staying?
couldn't you have been staying?
couldn't he have been staying?
couldn't we have been staying?
couldn't you have been staying?
couldn't they have been staying?