English verb conjugation
CAN ROOST

Regular verb: roost - roosted - roosted

Affirmation

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

Negation

Simple form	V-ing form
I can't roost you can't roost he can't roost we can't roost you can't roost they can't roost	I can't be roosting you can't be roosting he can't be roosting we can't be roosting you can't be roosting they can't be roosting
Perfect	V-ing perfect
I can't have roosted you can't have roosted he can't have roosted we can't have roosted you can't have roosted they can't have roosted	I can't have been roosting you can't have been roosting he can't have been roosting we can't have been roosting you can't have been roosting they can't have been roosting

Interrogative form

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

Interro-negative form

Simple form	V-ing form
can't I roost? can't you roost? can't he roost? can't we roost? can't you roost? can't they roost?	can't I be roosting? can't you be roosting? can't he be roosting? can't we be roosting? can't you be roosting? can't they be roosting?
Perfect	V-ing perfect
can't I have roosted? can't you have roosted? can't he have roosted? can't we have roosted? can't you have roosted? can't they have roosted?	can't I have been roosting? can't you have been roosting? can't he have been roosting? can't we have been roosting? can't you have been roosting? can't they have been roosting?