English verb conjugation
COULD HAVEN

Regular verb: haven - havened - havened

Affirmation

Simple form	V-ing form
I could haven you could haven he could haven we could haven you could haven they could haven	I could be havening you could be havening he could be havening we could be havening you could be havening they could be havening
Perfect	V-ing perfect
I could have havened you could have havened he could have havened we could have havened you could have havened they could have havened	I could have been havening you could have been havening he could have been havening we could have been havening you could have been havening they could have been havening

Negation

Simple form	V-ing form
I could not haven you could not haven he could not haven we could not haven you could not haven they could not haven	I could not be havening you could not be havening he could not be havening we could not be havening you could not be havening they could not be havening
Perfect	V-ing perfect
I could not have havened you could not have havened he could not have havened we could not have havened you could not have havened they could not have havened	I could not have been havening you could not have been havening he could not have been havening we could not have been havening you could not have been havening they could not have been havening

Interrogative form

Simple form	V-ing form
could I haven? could you haven? could he haven? could we haven? could you haven? could they haven?	could I be havening? could you be havening? could he be havening? could we be havening? could you be havening? could they be havening?
Perfect	V-ing perfect
could I have havened? could you have havened? could he have havened? could we have havened? could you have havened? could they have havened?	could I have been havening? could you have been havening? could he have been havening? could we have been havening? could you have been havening? could they have been havening?

Interro-negative form

Simple form	V-ing form
could I not haven? could you not haven? could he not haven? could we not haven? could you not haven? could they not haven?	could I not be havening? could you not be havening? could he not be havening? could we not be havening? could you not be havening? could they not be havening?
Perfect	V-ing perfect
could I not have havened? could you not have havened? could he not have havened? could we not have havened? could you not have havened? could they not have havened?	could I not have been havening? could you not have been havening? could he not have been havening? could we not have been havening? could you not have been havening? could they not have been havening?