English verb conjugation
COULD CONCERTIZE

Regular verb: concertize - concertized - concertized

Affirmation

Simple form	V-ing form
I could concertize you could concertize he could concertize we could concertize you could concertize they could concertize	I could be concertizing you could be concertizing he could be concertizing we could be concertizing you could be concertizing they could be concertizing
Perfect	V-ing perfect
I could have concertized you could have concertized he could have concertized we could have concertized you could have concertized they could have concertized	I could have been concertizing you could have been concertizing he could have been concertizing we could have been concertizing you could have been concertizing they could have been concertizing

Negation

Simple form	V-ing form
I couldn't concertize you couldn't concertize he couldn't concertize we couldn't concertize you couldn't concertize they couldn't concertize	I couldn't be concertizing you couldn't be concertizing he couldn't be concertizing we couldn't be concertizing you couldn't be concertizing they couldn't be concertizing
Perfect	V-ing perfect
I couldn't have concertized you couldn't have concertized he couldn't have concertized we couldn't have concertized you couldn't have concertized they couldn't have concertized	I couldn't have been concertizing you couldn't have been concertizing he couldn't have been concertizing we couldn't have been concertizing you couldn't have been concertizing they couldn't have been concertizing

Interrogative form

Simple form	V-ing form
could I concertize? could you concertize? could he concertize? could we concertize? could you concertize? could they concertize?	could I be concertizing? could you be concertizing? could he be concertizing? could we be concertizing? could you be concertizing? could they be concertizing?
Perfect	V-ing perfect
could I have concertized? could you have concertized? could he have concertized? could we have concertized? could you have concertized? could they have concertized?	could I have been concertizing? could you have been concertizing? could he have been concertizing? could we have been concertizing? could you have been concertizing? could they have been concertizing?

Interro-negative form

Simple form	V-ing form
couldn't I concertize? couldn't you concertize? couldn't he concertize? couldn't we concertize? couldn't you concertize? couldn't they concertize?	couldn't I be concertizing? couldn't you be concertizing? couldn't he be concertizing? couldn't we be concertizing? couldn't you be concertizing? couldn't they be concertizing?
Perfect	V-ing perfect
couldn't I have concertized? couldn't you have concertized? couldn't he have concertized? couldn't we have concertized? couldn't you have concertized? couldn't they have concertized?	couldn't I have been concertizing? couldn't you have been concertizing? couldn't he have been concertizing? couldn't we have been concertizing? couldn't you have been concertizing? couldn't they have been concertizing?