I can scale you can scale she can scale we can scale you can scale they can scale
V-ing form
I can be scaling you can be scaling she can be scaling we can be scaling you can be scaling they can be scaling
Perfect
I can have scaled you can have scaled she 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 she can have been scaling we can have been scaling you can have been scaling they can have been scaling
Negation
Simple form
I cannot scale you cannot scale she cannot scale we cannot scale you cannot scale they cannot scale
V-ing form
I cannot be scaling you cannot be scaling she cannot be scaling we cannot be scaling you cannot be scaling they cannot be scaling
Perfect
I cannot have scaled you cannot have scaled she cannot have scaled we cannot have scaled you cannot have scaled they cannot have scaled
V-ing perfect
I cannot have been scaling you cannot have been scaling she cannot have been scaling we cannot have been scaling you cannot have been scaling they cannot have been scaling
Interrogative form
Simple form
can I scale? can you scale? can she scale? can we scale? can you scale? can they scale?
V-ing form
can I be scaling? can you be scaling? can she be scaling? can we be scaling? can you be scaling? can they be scaling?
Perfect
can I have scaled? can you have scaled? can she 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 she have been scaling? can we have been scaling? can you have been scaling? can they have been scaling?
Interro-negative form
Simple form
can I not scale? can you not scale? can she not scale? can we not scale? can you not scale? can they not scale?
V-ing form
can I not be scaling? can you not be scaling? can she not be scaling? can we not be scaling? can you not be scaling? can they not be scaling?
Perfect
can I not have scaled? can you not have scaled? can she not have scaled? can we not have scaled? can you not have scaled? can they not have scaled?
V-ing perfect
can I not have been scaling? can you not have been scaling? can she not have been scaling? can we not have been scaling? can you not have been scaling? can they not have been scaling?