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
she could stay
we could stay
you could stay
they could stay 	I could be staying
you could be staying
she could be staying
we could be staying
you could be staying
they could be staying	I could have stayed
you could have stayed
she 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
she 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
she 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
she 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
she 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
she 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 she stay?
could we stay?
could you stay?
could they stay? 	could I be staying?
could you be staying?
could she be staying?
could we be staying?
could you be staying?
could they be staying? 	could I have stayed?
could you have stayed?
could she 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 she 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 she 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 she 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 she 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 she have been staying?
couldn't we have been staying?
couldn't you have been staying?
couldn't they have been staying?