English verb conjugation
COULD DESTABILIZE

Regular verb: destabilize - destabilized - destabilized

Affirmation

Simple form	V-ing form
I could destabilize you could destabilize he could destabilize we could destabilize you could destabilize they could destabilize	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	V-ing 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	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	V-ing form
I couldn't destabilize you couldn't destabilize he couldn't destabilize we couldn't destabilize you couldn't destabilize they couldn't destabilize	I couldn't be destabilizing you couldn't be destabilizing he couldn't be destabilizing we couldn't be destabilizing you couldn't be destabilizing they couldn't be destabilizing
Perfect	V-ing perfect
I couldn't have destabilized you couldn't have destabilized he couldn't have destabilized we couldn't have destabilized you couldn't have destabilized they couldn't have destabilized	I couldn't have been destabilizing you couldn't have been destabilizing he couldn't have been destabilizing we couldn't have been destabilizing you couldn't have been destabilizing they couldn't have been destabilizing

Interrogative form

Simple form	V-ing form
could I destabilize? could you destabilize? could he destabilize? could we destabilize? could you destabilize? could they destabilize?	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	V-ing 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?	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	V-ing form
couldn't I destabilize? couldn't you destabilize? couldn't he destabilize? couldn't we destabilize? couldn't you destabilize? couldn't they destabilize?	couldn't I be destabilizing? couldn't you be destabilizing? couldn't he be destabilizing? couldn't we be destabilizing? couldn't you be destabilizing? couldn't they be destabilizing?
Perfect	V-ing perfect
couldn't I have destabilized? couldn't you have destabilized? couldn't he have destabilized? couldn't we have destabilized? couldn't you have destabilized? couldn't they have destabilized?	couldn't I have been destabilizing? couldn't you have been destabilizing? couldn't he have been destabilizing? couldn't we have been destabilizing? couldn't you have been destabilizing? couldn't they have been destabilizing?