English verb conjugation
COULD ROOST

Regular verb: roost - roosted - roosted

Affirmation

Simple form	V-ing form
I could roost you could roost she could roost we could roost you could roost they could roost	I could be roosting you could be roosting she could be roosting we could be roosting you could be roosting they could be roosting
Perfect	V-ing perfect
I could have roosted you could have roosted she 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 she could have been roosting we could have been roosting you could have been roosting they could have been roosting

Negation

Simple form	V-ing form
I could not roost you could not roost she could not roost we could not roost you could not roost they could not roost	I could not be roosting you could not be roosting she could not be roosting we could not be roosting you could not be roosting they could not be roosting
Perfect	V-ing perfect
I could not have roosted you could not have roosted she could not have roosted we could not have roosted you could not have roosted they could not have roosted	I could not have been roosting you could not have been roosting she could not have been roosting we could not have been roosting you could not have been roosting they could not have been roosting

Interrogative form

Simple form	V-ing form
could I roost? could you roost? could she roost? could we roost? could you roost? could they roost?	could I be roosting? could you be roosting? could she be roosting? could we be roosting? could you be roosting? could they be roosting?
Perfect	V-ing perfect
could I have roosted? could you have roosted? could she 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 she have been roosting? could we have been roosting? could you have been roosting? could they have been roosting?

Interro-negative form

Simple form	V-ing form
could I not roost? could you not roost? could she not roost? could we not roost? could you not roost? could they not roost?	could I not be roosting? could you not be roosting? could she not be roosting? could we not be roosting? could you not be roosting? could they not be roosting?
Perfect	V-ing perfect
could I not have roosted? could you not have roosted? could she not have roosted? could we not have roosted? could you not have roosted? could they not have roosted?	could I not have been roosting? could you not have been roosting? could she not have been roosting? could we not have been roosting? could you not have been roosting? could they not have been roosting?