I can decalcify you can decalcify he can decalcify we can decalcify you can decalcify they can decalcify
V-ing form
I can be decalcifying you can be decalcifying he can be decalcifying we can be decalcifying you can be decalcifying they can be decalcifying
Perfect
I can have decalcified you can have decalcified he can have decalcified we can have decalcified you can have decalcified they can have decalcified
V-ing perfect
I can have been decalcifying you can have been decalcifying he can have been decalcifying we can have been decalcifying you can have been decalcifying they can have been decalcifying
Negation
Simple form
I cannot decalcify you cannot decalcify he cannot decalcify we cannot decalcify you cannot decalcify they cannot decalcify
V-ing form
I cannot be decalcifying you cannot be decalcifying he cannot be decalcifying we cannot be decalcifying you cannot be decalcifying they cannot be decalcifying
Perfect
I cannot have decalcified you cannot have decalcified he cannot have decalcified we cannot have decalcified you cannot have decalcified they cannot have decalcified
V-ing perfect
I cannot have been decalcifying you cannot have been decalcifying he cannot have been decalcifying we cannot have been decalcifying you cannot have been decalcifying they cannot have been decalcifying
Interrogative form
Simple form
can I decalcify? can you decalcify? can he decalcify? can we decalcify? can you decalcify? can they decalcify?
V-ing form
can I be decalcifying? can you be decalcifying? can he be decalcifying? can we be decalcifying? can you be decalcifying? can they be decalcifying?
Perfect
can I have decalcified? can you have decalcified? can he have decalcified? can we have decalcified? can you have decalcified? can they have decalcified?
V-ing perfect
can I have been decalcifying? can you have been decalcifying? can he have been decalcifying? can we have been decalcifying? can you have been decalcifying? can they have been decalcifying?
Interro-negative form
Simple form
can I not decalcify? can you not decalcify? can he not decalcify? can we not decalcify? can you not decalcify? can they not decalcify?
V-ing form
can I not be decalcifying? can you not be decalcifying? can he not be decalcifying? can we not be decalcifying? can you not be decalcifying? can they not be decalcifying?
Perfect
can I not have decalcified? can you not have decalcified? can he not have decalcified? can we not have decalcified? can you not have decalcified? can they not have decalcified?
V-ing perfect
can I not have been decalcifying? can you not have been decalcifying? can he not have been decalcifying? can we not have been decalcifying? can you not have been decalcifying? can they not have been decalcifying?