I could contravene you could contravene he could contravene we could contravene you could contravene they could contravene
V-ing form
I could be contravening you could be contravening he could be contravening we could be contravening you could be contravening they could be contravening
Perfect
I could have contravened you could have contravened he could have contravened we could have contravened you could have contravened they could have contravened
V-ing perfect
I could have been contravening you could have been contravening he could have been contravening we could have been contravening you could have been contravening they could have been contravening
Negation
Simple form
I could not contravene you could not contravene he could not contravene we could not contravene you could not contravene they could not contravene
V-ing form
I could not be contravening you could not be contravening he could not be contravening we could not be contravening you could not be contravening they could not be contravening
Perfect
I could not have contravened you could not have contravened he could not have contravened we could not have contravened you could not have contravened they could not have contravened
V-ing perfect
I could not have been contravening you could not have been contravening he could not have been contravening we could not have been contravening you could not have been contravening they could not have been contravening
Interrogative form
Simple form
could I contravene? could you contravene? could he contravene? could we contravene? could you contravene? could they contravene?
V-ing form
could I be contravening? could you be contravening? could he be contravening? could we be contravening? could you be contravening? could they be contravening?
Perfect
could I have contravened? could you have contravened? could he have contravened? could we have contravened? could you have contravened? could they have contravened?
V-ing perfect
could I have been contravening? could you have been contravening? could he have been contravening? could we have been contravening? could you have been contravening? could they have been contravening?
Interro-negative form
Simple form
could I not contravene? could you not contravene? could he not contravene? could we not contravene? could you not contravene? could they not contravene?
V-ing form
could I not be contravening? could you not be contravening? could he not be contravening? could we not be contravening? could you not be contravening? could they not be contravening?
Perfect
could I not have contravened? could you not have contravened? could he not have contravened? could we not have contravened? could you not have contravened? could they not have contravened?
V-ing perfect
could I not have been contravening? could you not have been contravening? could he not have been contravening? could we not have been contravening? could you not have been contravening? could they not have been contravening?