English verb conjugation
COULD OPPUGN

Regular verb: oppugn - oppugned - oppugned

Affirmation

Simple form	V-ing form
I could oppugn you could oppugn she could oppugn we could oppugn you could oppugn they could oppugn	I could be oppugning you could be oppugning she could be oppugning we could be oppugning you could be oppugning they could be oppugning
Perfect	V-ing perfect
I could have oppugned you could have oppugned she could have oppugned we could have oppugned you could have oppugned they could have oppugned	I could have been oppugning you could have been oppugning she could have been oppugning we could have been oppugning you could have been oppugning they could have been oppugning

Negation

Simple form	V-ing form
I could not oppugn you could not oppugn she could not oppugn we could not oppugn you could not oppugn they could not oppugn	I could not be oppugning you could not be oppugning she could not be oppugning we could not be oppugning you could not be oppugning they could not be oppugning
Perfect	V-ing perfect
I could not have oppugned you could not have oppugned she could not have oppugned we could not have oppugned you could not have oppugned they could not have oppugned	I could not have been oppugning you could not have been oppugning she could not have been oppugning we could not have been oppugning you could not have been oppugning they could not have been oppugning

Interrogative form

Simple form	V-ing form
could I oppugn? could you oppugn? could she oppugn? could we oppugn? could you oppugn? could they oppugn?	could I be oppugning? could you be oppugning? could she be oppugning? could we be oppugning? could you be oppugning? could they be oppugning?
Perfect	V-ing perfect
could I have oppugned? could you have oppugned? could she have oppugned? could we have oppugned? could you have oppugned? could they have oppugned?	could I have been oppugning? could you have been oppugning? could she have been oppugning? could we have been oppugning? could you have been oppugning? could they have been oppugning?

Interro-negative form

Simple form	V-ing form
could I not oppugn? could you not oppugn? could she not oppugn? could we not oppugn? could you not oppugn? could they not oppugn?	could I not be oppugning? could you not be oppugning? could she not be oppugning? could we not be oppugning? could you not be oppugning? could they not be oppugning?
Perfect	V-ing perfect
could I not have oppugned? could you not have oppugned? could she not have oppugned? could we not have oppugned? could you not have oppugned? could they not have oppugned?	could I not have been oppugning? could you not have been oppugning? could she not have been oppugning? could we not have been oppugning? could you not have been oppugning? could they not have been oppugning?