I can gridiron you can gridiron he can gridiron we can gridiron you can gridiron they can gridiron
V-ing form
I can be gridironing you can be gridironing he can be gridironing we can be gridironing you can be gridironing they can be gridironing
Perfect
I can have gridironed you can have gridironed he can have gridironed we can have gridironed you can have gridironed they can have gridironed
V-ing perfect
I can have been gridironing you can have been gridironing he can have been gridironing we can have been gridironing you can have been gridironing they can have been gridironing
Negation
Simple form
I can't gridiron you can't gridiron he can't gridiron we can't gridiron you can't gridiron they can't gridiron
V-ing form
I can't be gridironing you can't be gridironing he can't be gridironing we can't be gridironing you can't be gridironing they can't be gridironing
Perfect
I can't have gridironed you can't have gridironed he can't have gridironed we can't have gridironed you can't have gridironed they can't have gridironed
V-ing perfect
I can't have been gridironing you can't have been gridironing he can't have been gridironing we can't have been gridironing you can't have been gridironing they can't have been gridironing
Interrogative form
Simple form
can I gridiron? can you gridiron? can he gridiron? can we gridiron? can you gridiron? can they gridiron?
V-ing form
can I be gridironing? can you be gridironing? can he be gridironing? can we be gridironing? can you be gridironing? can they be gridironing?
Perfect
can I have gridironed? can you have gridironed? can he have gridironed? can we have gridironed? can you have gridironed? can they have gridironed?
V-ing perfect
can I have been gridironing? can you have been gridironing? can he have been gridironing? can we have been gridironing? can you have been gridironing? can they have been gridironing?
Interro-negative form
Simple form
can't I gridiron? can't you gridiron? can't he gridiron? can't we gridiron? can't you gridiron? can't they gridiron?
V-ing form
can't I be gridironing? can't you be gridironing? can't he be gridironing? can't we be gridironing? can't you be gridironing? can't they be gridironing?
Perfect
can't I have gridironed? can't you have gridironed? can't he have gridironed? can't we have gridironed? can't you have gridironed? can't they have gridironed?
V-ing perfect
can't I have been gridironing? can't you have been gridironing? can't he have been gridironing? can't we have been gridironing? can't you have been gridironing? can't they have been gridironing?