English verb conjugation
COULD CONCRETIZE

Regular verb: concretize - concretized - concretized

Affirmation

Simple form	V-ing form
I could concretize you could concretize she could concretize we could concretize you could concretize they could concretize	I could be concretizing you could be concretizing she could be concretizing we could be concretizing you could be concretizing they could be concretizing
Perfect	V-ing perfect
I could have concretized you could have concretized she could have concretized we could have concretized you could have concretized they could have concretized	I could have been concretizing you could have been concretizing she could have been concretizing we could have been concretizing you could have been concretizing they could have been concretizing

Negation

Simple form	V-ing form
I could not concretize you could not concretize she could not concretize we could not concretize you could not concretize they could not concretize	I could not be concretizing you could not be concretizing she could not be concretizing we could not be concretizing you could not be concretizing they could not be concretizing
Perfect	V-ing perfect
I could not have concretized you could not have concretized she could not have concretized we could not have concretized you could not have concretized they could not have concretized	I could not have been concretizing you could not have been concretizing she could not have been concretizing we could not have been concretizing you could not have been concretizing they could not have been concretizing

Interrogative form

Simple form	V-ing form
could I concretize? could you concretize? could she concretize? could we concretize? could you concretize? could they concretize?	could I be concretizing? could you be concretizing? could she be concretizing? could we be concretizing? could you be concretizing? could they be concretizing?
Perfect	V-ing perfect
could I have concretized? could you have concretized? could she have concretized? could we have concretized? could you have concretized? could they have concretized?	could I have been concretizing? could you have been concretizing? could she have been concretizing? could we have been concretizing? could you have been concretizing? could they have been concretizing?

Interro-negative form

Simple form	V-ing form
could I not concretize? could you not concretize? could she not concretize? could we not concretize? could you not concretize? could they not concretize?	could I not be concretizing? could you not be concretizing? could she not be concretizing? could we not be concretizing? could you not be concretizing? could they not be concretizing?
Perfect	V-ing perfect
could I not have concretized? could you not have concretized? could she not have concretized? could we not have concretized? could you not have concretized? could they not have concretized?	could I not have been concretizing? could you not have been concretizing? could she not have been concretizing? could we not have been concretizing? could you not have been concretizing? could they not have been concretizing?