English verb conjugation
COULD NULLIFY

Regular verb: nullify - nullified - nullified

Affirmation

Simple form	V-ing form
I could nullify you could nullify he could nullify we could nullify you could nullify they could nullify	I could be nullifying you could be nullifying he could be nullifying we could be nullifying you could be nullifying they could be nullifying
Perfect	V-ing perfect
I could have nullified you could have nullified he could have nullified we could have nullified you could have nullified they could have nullified	I could have been nullifying you could have been nullifying he could have been nullifying we could have been nullifying you could have been nullifying they could have been nullifying

Negation

Simple form	V-ing form
I couldn't nullify you couldn't nullify he couldn't nullify we couldn't nullify you couldn't nullify they couldn't nullify	I couldn't be nullifying you couldn't be nullifying he couldn't be nullifying we couldn't be nullifying you couldn't be nullifying they couldn't be nullifying
Perfect	V-ing perfect
I couldn't have nullified you couldn't have nullified he couldn't have nullified we couldn't have nullified you couldn't have nullified they couldn't have nullified	I couldn't have been nullifying you couldn't have been nullifying he couldn't have been nullifying we couldn't have been nullifying you couldn't have been nullifying they couldn't have been nullifying

Interrogative form

Simple form	V-ing form
could I nullify? could you nullify? could he nullify? could we nullify? could you nullify? could they nullify?	could I be nullifying? could you be nullifying? could he be nullifying? could we be nullifying? could you be nullifying? could they be nullifying?
Perfect	V-ing perfect
could I have nullified? could you have nullified? could he have nullified? could we have nullified? could you have nullified? could they have nullified?	could I have been nullifying? could you have been nullifying? could he have been nullifying? could we have been nullifying? could you have been nullifying? could they have been nullifying?

Interro-negative form

Simple form	V-ing form
couldn't I nullify? couldn't you nullify? couldn't he nullify? couldn't we nullify? couldn't you nullify? couldn't they nullify?	couldn't I be nullifying? couldn't you be nullifying? couldn't he be nullifying? couldn't we be nullifying? couldn't you be nullifying? couldn't they be nullifying?
Perfect	V-ing perfect
couldn't I have nullified? couldn't you have nullified? couldn't he have nullified? couldn't we have nullified? couldn't you have nullified? couldn't they have nullified?	couldn't I have been nullifying? couldn't you have been nullifying? couldn't he have been nullifying? couldn't we have been nullifying? couldn't you have been nullifying? couldn't they have been nullifying?