I can stultify you can stultify he can stultify we can stultify you can stultify they can stultify
V-ing form
I can be stultifying you can be stultifying he can be stultifying we can be stultifying you can be stultifying they can be stultifying
Perfect
I can have stultified you can have stultified he can have stultified we can have stultified you can have stultified they can have stultified
V-ing perfect
I can have been stultifying you can have been stultifying he can have been stultifying we can have been stultifying you can have been stultifying they can have been stultifying
Negation
Simple form
I can't stultify you can't stultify he can't stultify we can't stultify you can't stultify they can't stultify
V-ing form
I can't be stultifying you can't be stultifying he can't be stultifying we can't be stultifying you can't be stultifying they can't be stultifying
Perfect
I can't have stultified you can't have stultified he can't have stultified we can't have stultified you can't have stultified they can't have stultified
V-ing perfect
I can't have been stultifying you can't have been stultifying he can't have been stultifying we can't have been stultifying you can't have been stultifying they can't have been stultifying
Interrogative form
Simple form
can I stultify? can you stultify? can he stultify? can we stultify? can you stultify? can they stultify?
V-ing form
can I be stultifying? can you be stultifying? can he be stultifying? can we be stultifying? can you be stultifying? can they be stultifying?
Perfect
can I have stultified? can you have stultified? can he have stultified? can we have stultified? can you have stultified? can they have stultified?
V-ing perfect
can I have been stultifying? can you have been stultifying? can he have been stultifying? can we have been stultifying? can you have been stultifying? can they have been stultifying?
Interro-negative form
Simple form
can't I stultify? can't you stultify? can't he stultify? can't we stultify? can't you stultify? can't they stultify?
V-ing form
can't I be stultifying? can't you be stultifying? can't he be stultifying? can't we be stultifying? can't you be stultifying? can't they be stultifying?
Perfect
can't I have stultified? can't you have stultified? can't he have stultified? can't we have stultified? can't you have stultified? can't they have stultified?
V-ing perfect
can't I have been stultifying? can't you have been stultifying? can't he have been stultifying? can't we have been stultifying? can't you have been stultifying? can't they have been stultifying?