English verb conjugation
COULD PASSIVIZE

Regular verb: passivize - passivized - passivized

Affirmation

Simple form	V-ing form
I could passivize you could passivize she could passivize we could passivize you could passivize they could passivize	I could be passivizing you could be passivizing she could be passivizing we could be passivizing you could be passivizing they could be passivizing
Perfect	V-ing perfect
I could have passivized you could have passivized she could have passivized we could have passivized you could have passivized they could have passivized	I could have been passivizing you could have been passivizing she could have been passivizing we could have been passivizing you could have been passivizing they could have been passivizing

Negation

Simple form	V-ing form
I couldn't passivize you couldn't passivize she couldn't passivize we couldn't passivize you couldn't passivize they couldn't passivize	I couldn't be passivizing you couldn't be passivizing she couldn't be passivizing we couldn't be passivizing you couldn't be passivizing they couldn't be passivizing
Perfect	V-ing perfect
I couldn't have passivized you couldn't have passivized she couldn't have passivized we couldn't have passivized you couldn't have passivized they couldn't have passivized	I couldn't have been passivizing you couldn't have been passivizing she couldn't have been passivizing we couldn't have been passivizing you couldn't have been passivizing they couldn't have been passivizing

Interrogative form

Simple form	V-ing form
could I passivize? could you passivize? could she passivize? could we passivize? could you passivize? could they passivize?	could I be passivizing? could you be passivizing? could she be passivizing? could we be passivizing? could you be passivizing? could they be passivizing?
Perfect	V-ing perfect
could I have passivized? could you have passivized? could she have passivized? could we have passivized? could you have passivized? could they have passivized?	could I have been passivizing? could you have been passivizing? could she have been passivizing? could we have been passivizing? could you have been passivizing? could they have been passivizing?

Interro-negative form

Simple form	V-ing form
couldn't I passivize? couldn't you passivize? couldn't she passivize? couldn't we passivize? couldn't you passivize? couldn't they passivize?	couldn't I be passivizing? couldn't you be passivizing? couldn't she be passivizing? couldn't we be passivizing? couldn't you be passivizing? couldn't they be passivizing?
Perfect	V-ing perfect
couldn't I have passivized? couldn't you have passivized? couldn't she have passivized? couldn't we have passivized? couldn't you have passivized? couldn't they have passivized?	couldn't I have been passivizing? couldn't you have been passivizing? couldn't she have been passivizing? couldn't we have been passivizing? couldn't you have been passivizing? couldn't they have been passivizing?