I could destabilize you could destabilize he could destabilize we could destabilize you could destabilize they could destabilize
V-ing form
I could be destabilizing you could be destabilizing he could be destabilizing we could be destabilizing you could be destabilizing they could be destabilizing
Perfect
I could have destabilized you could have destabilized he could have destabilized we could have destabilized you could have destabilized they could have destabilized
V-ing perfect
I could have been destabilizing you could have been destabilizing he could have been destabilizing we could have been destabilizing you could have been destabilizing they could have been destabilizing
Negation
Simple form
I could not destabilize you could not destabilize he could not destabilize we could not destabilize you could not destabilize they could not destabilize
V-ing form
I could not be destabilizing you could not be destabilizing he could not be destabilizing we could not be destabilizing you could not be destabilizing they could not be destabilizing
Perfect
I could not have destabilized you could not have destabilized he could not have destabilized we could not have destabilized you could not have destabilized they could not have destabilized
V-ing perfect
I could not have been destabilizing you could not have been destabilizing he could not have been destabilizing we could not have been destabilizing you could not have been destabilizing they could not have been destabilizing
Interrogative form
Simple form
could I destabilize? could you destabilize? could he destabilize? could we destabilize? could you destabilize? could they destabilize?
V-ing form
could I be destabilizing? could you be destabilizing? could he be destabilizing? could we be destabilizing? could you be destabilizing? could they be destabilizing?
Perfect
could I have destabilized? could you have destabilized? could he have destabilized? could we have destabilized? could you have destabilized? could they have destabilized?
V-ing perfect
could I have been destabilizing? could you have been destabilizing? could he have been destabilizing? could we have been destabilizing? could you have been destabilizing? could they have been destabilizing?
Interro-negative form
Simple form
could I not destabilize? could you not destabilize? could he not destabilize? could we not destabilize? could you not destabilize? could they not destabilize?
V-ing form
could I not be destabilizing? could you not be destabilizing? could he not be destabilizing? could we not be destabilizing? could you not be destabilizing? could they not be destabilizing?
Perfect
could I not have destabilized? could you not have destabilized? could he not have destabilized? could we not have destabilized? could you not have destabilized? could they not have destabilized?
V-ing perfect
could I not have been destabilizing? could you not have been destabilizing? could he not have been destabilizing? could we not have been destabilizing? could you not have been destabilizing? could they not have been destabilizing?