English verb conjugation
COULD INVALID

Regular verb: invalid - invalided - invalided

Affirmation

Simple form	V-ing form
I could invalid you could invalid he could invalid we could invalid you could invalid they could invalid	I could be invaliding you could be invaliding he could be invaliding we could be invaliding you could be invaliding they could be invaliding
Perfect	V-ing perfect
I could have invalided you could have invalided he could have invalided we could have invalided you could have invalided they could have invalided	I could have been invaliding you could have been invaliding he could have been invaliding we could have been invaliding you could have been invaliding they could have been invaliding

Negation

Simple form	V-ing form
I could not invalid you could not invalid he could not invalid we could not invalid you could not invalid they could not invalid	I could not be invaliding you could not be invaliding he could not be invaliding we could not be invaliding you could not be invaliding they could not be invaliding
Perfect	V-ing perfect
I could not have invalided you could not have invalided he could not have invalided we could not have invalided you could not have invalided they could not have invalided	I could not have been invaliding you could not have been invaliding he could not have been invaliding we could not have been invaliding you could not have been invaliding they could not have been invaliding

Interrogative form

Simple form	V-ing form
could I invalid? could you invalid? could he invalid? could we invalid? could you invalid? could they invalid?	could I be invaliding? could you be invaliding? could he be invaliding? could we be invaliding? could you be invaliding? could they be invaliding?
Perfect	V-ing perfect
could I have invalided? could you have invalided? could he have invalided? could we have invalided? could you have invalided? could they have invalided?	could I have been invaliding? could you have been invaliding? could he have been invaliding? could we have been invaliding? could you have been invaliding? could they have been invaliding?

Interro-negative form

Simple form	V-ing form
could I not invalid? could you not invalid? could he not invalid? could we not invalid? could you not invalid? could they not invalid?	could I not be invaliding? could you not be invaliding? could he not be invaliding? could we not be invaliding? could you not be invaliding? could they not be invaliding?
Perfect	V-ing perfect
could I not have invalided? could you not have invalided? could he not have invalided? could we not have invalided? could you not have invalided? could they not have invalided?	could I not have been invaliding? could you not have been invaliding? could he not have been invaliding? could we not have been invaliding? could you not have been invaliding? could they not have been invaliding?