I could stabilize you could stabilize he could stabilize we could stabilize you could stabilize they could stabilize
V-ing form
I could be stabilizing you could be stabilizing he could be stabilizing we could be stabilizing you could be stabilizing they could be stabilizing
Perfect
I could have stabilized you could have stabilized he could have stabilized we could have stabilized you could have stabilized they could have stabilized
V-ing perfect
I could have been stabilizing you could have been stabilizing he could have been stabilizing we could have been stabilizing you could have been stabilizing they could have been stabilizing
Negation
Simple form
I could not stabilize you could not stabilize he could not stabilize we could not stabilize you could not stabilize they could not stabilize
V-ing form
I could not be stabilizing you could not be stabilizing he could not be stabilizing we could not be stabilizing you could not be stabilizing they could not be stabilizing
Perfect
I could not have stabilized you could not have stabilized he could not have stabilized we could not have stabilized you could not have stabilized they could not have stabilized
V-ing perfect
I could not have been stabilizing you could not have been stabilizing he could not have been stabilizing we could not have been stabilizing you could not have been stabilizing they could not have been stabilizing
Interrogative form
Simple form
could I stabilize? could you stabilize? could he stabilize? could we stabilize? could you stabilize? could they stabilize?
V-ing form
could I be stabilizing? could you be stabilizing? could he be stabilizing? could we be stabilizing? could you be stabilizing? could they be stabilizing?
Perfect
could I have stabilized? could you have stabilized? could he have stabilized? could we have stabilized? could you have stabilized? could they have stabilized?
V-ing perfect
could I have been stabilizing? could you have been stabilizing? could he have been stabilizing? could we have been stabilizing? could you have been stabilizing? could they have been stabilizing?
Interro-negative form
Simple form
could I not stabilize? could you not stabilize? could he not stabilize? could we not stabilize? could you not stabilize? could they not stabilize?
V-ing form
could I not be stabilizing? could you not be stabilizing? could he not be stabilizing? could we not be stabilizing? could you not be stabilizing? could they not be stabilizing?
Perfect
could I not have stabilized? could you not have stabilized? could he not have stabilized? could we not have stabilized? could you not have stabilized? could they not have stabilized?
V-ing perfect
could I not have been stabilizing? could you not have been stabilizing? could he not have been stabilizing? could we not have been stabilizing? could you not have been stabilizing? could they not have been stabilizing?