I can scale you can scale he can scale we can scale you can scale they can scale
V-ing form
I can be scaling you can be scaling he can be scaling we can be scaling you can be scaling they can be scaling
Perfect
I can have scaled you can have scaled he can have scaled we can have scaled you can have scaled they can have scaled
V-ing perfect
I can have been scaling you can have been scaling he can have been scaling we can have been scaling you can have been scaling they can have been scaling
Negation
Simple form
I can't scale you can't scale he can't scale we can't scale you can't scale they can't scale
V-ing form
I can't be scaling you can't be scaling he can't be scaling we can't be scaling you can't be scaling they can't be scaling
Perfect
I can't have scaled you can't have scaled he can't have scaled we can't have scaled you can't have scaled they can't have scaled
V-ing perfect
I can't have been scaling you can't have been scaling he can't have been scaling we can't have been scaling you can't have been scaling they can't have been scaling
Interrogative form
Simple form
can I scale? can you scale? can he scale? can we scale? can you scale? can they scale?
V-ing form
can I be scaling? can you be scaling? can he be scaling? can we be scaling? can you be scaling? can they be scaling?
Perfect
can I have scaled? can you have scaled? can he have scaled? can we have scaled? can you have scaled? can they have scaled?
V-ing perfect
can I have been scaling? can you have been scaling? can he have been scaling? can we have been scaling? can you have been scaling? can they have been scaling?
Interro-negative form
Simple form
can't I scale? can't you scale? can't he scale? can't we scale? can't you scale? can't they scale?
V-ing form
can't I be scaling? can't you be scaling? can't he be scaling? can't we be scaling? can't you be scaling? can't they be scaling?
Perfect
can't I have scaled? can't you have scaled? can't he have scaled? can't we have scaled? can't you have scaled? can't they have scaled?
V-ing perfect
can't I have been scaling? can't you have been scaling? can't he have been scaling? can't we have been scaling? can't you have been scaling? can't they have been scaling?