I could stultify you could stultify she could stultify we could stultify you could stultify they could stultify
V-ing form
I could be stultifying you could be stultifying she could be stultifying we could be stultifying you could be stultifying they could be stultifying
Perfect
I could have stultified you could have stultified she could have stultified we could have stultified you could have stultified they could have stultified
V-ing perfect
I could have been stultifying you could have been stultifying she could have been stultifying we could have been stultifying you could have been stultifying they could have been stultifying
Negation
Simple form
I could not stultify you could not stultify she could not stultify we could not stultify you could not stultify they could not stultify
V-ing form
I could not be stultifying you could not be stultifying she could not be stultifying we could not be stultifying you could not be stultifying they could not be stultifying
Perfect
I could not have stultified you could not have stultified she could not have stultified we could not have stultified you could not have stultified they could not have stultified
V-ing perfect
I could not have been stultifying you could not have been stultifying she could not have been stultifying we could not have been stultifying you could not have been stultifying they could not have been stultifying
Interrogative form
Simple form
could I stultify? could you stultify? could she stultify? could we stultify? could you stultify? could they stultify?
V-ing form
could I be stultifying? could you be stultifying? could she be stultifying? could we be stultifying? could you be stultifying? could they be stultifying?
Perfect
could I have stultified? could you have stultified? could she have stultified? could we have stultified? could you have stultified? could they have stultified?
V-ing perfect
could I have been stultifying? could you have been stultifying? could she have been stultifying? could we have been stultifying? could you have been stultifying? could they have been stultifying?
Interro-negative form
Simple form
could I not stultify? could you not stultify? could she not stultify? could we not stultify? could you not stultify? could they not stultify?
V-ing form
could I not be stultifying? could you not be stultifying? could she not be stultifying? could we not be stultifying? could you not be stultifying? could they not be stultifying?
Perfect
could I not have stultified? could you not have stultified? could she not have stultified? could we not have stultified? could you not have stultified? could they not have stultified?
V-ing perfect
could I not have been stultifying? could you not have been stultifying? could she not have been stultifying? could we not have been stultifying? could you not have been stultifying? could they not have been stultifying?