English verb conjugation
COULD NULLIFY

Regular verb: nullify - nullified - nullified

Affirmation

Simple form	V-ing form
I could nullify you could nullify she could nullify we could nullify you could nullify they could nullify	I could be nullifying you could be nullifying she 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 she 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 she 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 could not nullify you could not nullify she could not nullify we could not nullify you could not nullify they could not nullify	I could not be nullifying you could not be nullifying she could not be nullifying we could not be nullifying you could not be nullifying they could not be nullifying
Perfect	V-ing perfect
I could not have nullified you could not have nullified she could not have nullified we could not have nullified you could not have nullified they could not have nullified	I could not have been nullifying you could not have been nullifying she could not have been nullifying we could not have been nullifying you could not have been nullifying they could not have been nullifying

Interrogative form

Simple form	V-ing form
could I nullify? could you nullify? could she nullify? could we nullify? could you nullify? could they nullify?	could I be nullifying? could you be nullifying? could she 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 she 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 she 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
could I not nullify? could you not nullify? could she not nullify? could we not nullify? could you not nullify? could they not nullify?	could I not be nullifying? could you not be nullifying? could she not be nullifying? could we not be nullifying? could you not be nullifying? could they not be nullifying?
Perfect	V-ing perfect
could I not have nullified? could you not have nullified? could she not have nullified? could we not have nullified? could you not have nullified? could they not have nullified?	could I not have been nullifying? could you not have been nullifying? could she not have been nullifying? could we not have been nullifying? could you not have been nullifying? could they not have been nullifying?