I can seat you can seat he can seat we can seat you can seat they can seat
V-ing form
I can be seating you can be seating he can be seating we can be seating you can be seating they can be seating
Perfect
I can have seated you can have seated he can have seated we can have seated you can have seated they can have seated
V-ing perfect
I can have been seating you can have been seating he can have been seating we can have been seating you can have been seating they can have been seating
Negation
Simple form
I can't seat you can't seat he can't seat we can't seat you can't seat they can't seat
V-ing form
I can't be seating you can't be seating he can't be seating we can't be seating you can't be seating they can't be seating
Perfect
I can't have seated you can't have seated he can't have seated we can't have seated you can't have seated they can't have seated
V-ing perfect
I can't have been seating you can't have been seating he can't have been seating we can't have been seating you can't have been seating they can't have been seating
Interrogative form
Simple form
can I seat? can you seat? can he seat? can we seat? can you seat? can they seat?
V-ing form
can I be seating? can you be seating? can he be seating? can we be seating? can you be seating? can they be seating?
Perfect
can I have seated? can you have seated? can he have seated? can we have seated? can you have seated? can they have seated?
V-ing perfect
can I have been seating? can you have been seating? can he have been seating? can we have been seating? can you have been seating? can they have been seating?
Interro-negative form
Simple form
can't I seat? can't you seat? can't he seat? can't we seat? can't you seat? can't they seat?
V-ing form
can't I be seating? can't you be seating? can't he be seating? can't we be seating? can't you be seating? can't they be seating?
Perfect
can't I have seated? can't you have seated? can't he have seated? can't we have seated? can't you have seated? can't they have seated?
V-ing perfect
can't I have been seating? can't you have been seating? can't he have been seating? can't we have been seating? can't you have been seating? can't they have been seating?