English verb conjugation
COULD STULTIFY

Regular verb: stultify - stultified - stultified

Affirmation

Simple form	V-ing form
I could stultify you could stultify he could stultify we could stultify you could stultify they could stultify	I could be stultifying you could be stultifying he could be stultifying we could be stultifying you could be stultifying they could be stultifying
Perfect	V-ing perfect
I could have stultified you could have stultified he could have stultified we could have stultified you could have stultified they could have stultified	I could have been stultifying you could have been stultifying he could have been stultifying we could have been stultifying you could have been stultifying they could have been stultifying

Negation

Simple form	V-ing form
I couldn't stultify you couldn't stultify he couldn't stultify we couldn't stultify you couldn't stultify they couldn't stultify	I couldn't be stultifying you couldn't be stultifying he couldn't be stultifying we couldn't be stultifying you couldn't be stultifying they couldn't be stultifying
Perfect	V-ing perfect
I couldn't have stultified you couldn't have stultified he couldn't have stultified we couldn't have stultified you couldn't have stultified they couldn't have stultified	I couldn't have been stultifying you couldn't have been stultifying he couldn't have been stultifying we couldn't have been stultifying you couldn't have been stultifying they couldn't have been stultifying

Interrogative form

Simple form	V-ing form
could I stultify? could you stultify? could he stultify? could we stultify? could you stultify? could they stultify?	could I be stultifying? could you be stultifying? could he be stultifying? could we be stultifying? could you be stultifying? could they be stultifying?
Perfect	V-ing perfect
could I have stultified? could you have stultified? could he have stultified? could we have stultified? could you have stultified? could they have stultified?	could I have been stultifying? could you have been stultifying? could he have been stultifying? could we have been stultifying? could you have been stultifying? could they have been stultifying?

Interro-negative form

Simple form	V-ing form
couldn't I stultify? couldn't you stultify? couldn't he stultify? couldn't we stultify? couldn't you stultify? couldn't they stultify?	couldn't I be stultifying? couldn't you be stultifying? couldn't he be stultifying? couldn't we be stultifying? couldn't you be stultifying? couldn't they be stultifying?
Perfect	V-ing perfect
couldn't I have stultified? couldn't you have stultified? couldn't he have stultified? couldn't we have stultified? couldn't you have stultified? couldn't they have stultified?	couldn't I have been stultifying? couldn't you have been stultifying? couldn't he have been stultifying? couldn't we have been stultifying? couldn't you have been stultifying? couldn't they have been stultifying?