English verb conjugation
COULD CRYSTALLIZE

Regular verb: crystallize - crystallized - crystallized

Affirmation

Simple form	V-ing form
I could crystallize you could crystallize she could crystallize we could crystallize you could crystallize they could crystallize	I could be crystallizing you could be crystallizing she could be crystallizing we could be crystallizing you could be crystallizing they could be crystallizing
Perfect	V-ing perfect
I could have crystallized you could have crystallized she could have crystallized we could have crystallized you could have crystallized they could have crystallized	I could have been crystallizing you could have been crystallizing she could have been crystallizing we could have been crystallizing you could have been crystallizing they could have been crystallizing

Negation

Simple form	V-ing form
I could not crystallize you could not crystallize she could not crystallize we could not crystallize you could not crystallize they could not crystallize	I could not be crystallizing you could not be crystallizing she could not be crystallizing we could not be crystallizing you could not be crystallizing they could not be crystallizing
Perfect	V-ing perfect
I could not have crystallized you could not have crystallized she could not have crystallized we could not have crystallized you could not have crystallized they could not have crystallized	I could not have been crystallizing you could not have been crystallizing she could not have been crystallizing we could not have been crystallizing you could not have been crystallizing they could not have been crystallizing

Interrogative form

Simple form	V-ing form
could I crystallize? could you crystallize? could she crystallize? could we crystallize? could you crystallize? could they crystallize?	could I be crystallizing? could you be crystallizing? could she be crystallizing? could we be crystallizing? could you be crystallizing? could they be crystallizing?
Perfect	V-ing perfect
could I have crystallized? could you have crystallized? could she have crystallized? could we have crystallized? could you have crystallized? could they have crystallized?	could I have been crystallizing? could you have been crystallizing? could she have been crystallizing? could we have been crystallizing? could you have been crystallizing? could they have been crystallizing?

Interro-negative form

Simple form	V-ing form
could I not crystallize? could you not crystallize? could she not crystallize? could we not crystallize? could you not crystallize? could they not crystallize?	could I not be crystallizing? could you not be crystallizing? could she not be crystallizing? could we not be crystallizing? could you not be crystallizing? could they not be crystallizing?
Perfect	V-ing perfect
could I not have crystallized? could you not have crystallized? could she not have crystallized? could we not have crystallized? could you not have crystallized? could they not have crystallized?	could I not have been crystallizing? could you not have been crystallizing? could she not have been crystallizing? could we not have been crystallizing? could you not have been crystallizing? could they not have been crystallizing?