could roost
Verbo regular: roost - roosted- roosted

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could roost
you could roost
he could roost
we could roost
you could roost
they could roost 	I could be roosting
you could be roosting
he could be roosting
we could be roosting
you could be roosting
they could be roosting	I could have roosted
you could have roosted
he could have roosted
we could have roosted
you could have roosted
they could have roosted	I could have been roosting
you could have been roosting
he could have been roosting
we could have been roosting
you could have been roosting
they could have been roosting	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I couldn't roost
you couldn't roost
he couldn't roost
we couldn't roost
you couldn't roost
they couldn't roost 	I couldn't be roosting
you couldn't be roosting
he couldn't be roosting
we couldn't be roosting
you couldn't be roosting
they couldn't be roosting	I couldn't have roosted
you couldn't have roosted
he couldn't have roosted
we couldn't have roosted
you couldn't have roosted
they couldn't have roosted	I couldn't have been roosting
you couldn't have been roosting
he couldn't have been roosting
we couldn't have been roosting
you couldn't have been roosting
they couldn't have been roosting	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I roost?
could you roost?
could he roost?
could we roost?
could you roost?
could they roost? 	could I be roosting?
could you be roosting?
could he be roosting?
could we be roosting?
could you be roosting?
could they be roosting? 	could I have roosted?
could you have roosted?
could he have roosted?
could we have roosted?
could you have roosted?
could they have roosted? 	could I have been roosting?
could you have been roosting?
could he have been roosting?
could we have been roosting?
could you have been roosting?
could they have been roosting? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
couldn't I roost?
couldn't you roost?
couldn't he roost?
couldn't we roost?
couldn't you roost?
couldn't they roost? 	couldn't I be roosting?
couldn't you be roosting?
couldn't he be roosting?
couldn't we be roosting?
couldn't you be roosting?
couldn't they be roosting? 	couldn't I have roosted?
couldn't you have roosted?
couldn't he have roosted?
couldn't we have roosted?
couldn't you have roosted?
couldn't they have roosted? 	couldn't I have been roosting?
couldn't you have been roosting?
couldn't he have been roosting?
couldn't we have been roosting?
couldn't you have been roosting?
couldn't they have been roosting?