I can kitten you can kitten he can kitten we can kitten you can kitten they can kitten
V-ing form
I can be kittening you can be kittening he can be kittening we can be kittening you can be kittening they can be kittening
Perfect
I can have kittened you can have kittened he can have kittened we can have kittened you can have kittened they can have kittened
V-ing perfect
I can have been kittening you can have been kittening he can have been kittening we can have been kittening you can have been kittening they can have been kittening
Negation
Simple form
I can't kitten you can't kitten he can't kitten we can't kitten you can't kitten they can't kitten
V-ing form
I can't be kittening you can't be kittening he can't be kittening we can't be kittening you can't be kittening they can't be kittening
Perfect
I can't have kittened you can't have kittened he can't have kittened we can't have kittened you can't have kittened they can't have kittened
V-ing perfect
I can't have been kittening you can't have been kittening he can't have been kittening we can't have been kittening you can't have been kittening they can't have been kittening
Interrogative form
Simple form
can I kitten? can you kitten? can he kitten? can we kitten? can you kitten? can they kitten?
V-ing form
can I be kittening? can you be kittening? can he be kittening? can we be kittening? can you be kittening? can they be kittening?
Perfect
can I have kittened? can you have kittened? can he have kittened? can we have kittened? can you have kittened? can they have kittened?
V-ing perfect
can I have been kittening? can you have been kittening? can he have been kittening? can we have been kittening? can you have been kittening? can they have been kittening?
Interro-negative form
Simple form
can't I kitten? can't you kitten? can't he kitten? can't we kitten? can't you kitten? can't they kitten?
V-ing form
can't I be kittening? can't you be kittening? can't he be kittening? can't we be kittening? can't you be kittening? can't they be kittening?
Perfect
can't I have kittened? can't you have kittened? can't he have kittened? can't we have kittened? can't you have kittened? can't they have kittened?
V-ing perfect
can't I have been kittening? can't you have been kittening? can't he have been kittening? can't we have been kittening? can't you have been kittening? can't they have been kittening?