English verb conjugation
COULD WINTERIZE

Regular verb: winterize - winterized - winterized

Affirmation

Simple form	V-ing form
I could winterize you could winterize he could winterize we could winterize you could winterize they could winterize	I could be winterizing you could be winterizing he could be winterizing we could be winterizing you could be winterizing they could be winterizing
Perfect	V-ing perfect
I could have winterized you could have winterized he could have winterized we could have winterized you could have winterized they could have winterized	I could have been winterizing you could have been winterizing he could have been winterizing we could have been winterizing you could have been winterizing they could have been winterizing

Negation

Simple form	V-ing form
I could not winterize you could not winterize he could not winterize we could not winterize you could not winterize they could not winterize	I could not be winterizing you could not be winterizing he could not be winterizing we could not be winterizing you could not be winterizing they could not be winterizing
Perfect	V-ing perfect
I could not have winterized you could not have winterized he could not have winterized we could not have winterized you could not have winterized they could not have winterized	I could not have been winterizing you could not have been winterizing he could not have been winterizing we could not have been winterizing you could not have been winterizing they could not have been winterizing

Interrogative form

Simple form	V-ing form
could I winterize? could you winterize? could he winterize? could we winterize? could you winterize? could they winterize?	could I be winterizing? could you be winterizing? could he be winterizing? could we be winterizing? could you be winterizing? could they be winterizing?
Perfect	V-ing perfect
could I have winterized? could you have winterized? could he have winterized? could we have winterized? could you have winterized? could they have winterized?	could I have been winterizing? could you have been winterizing? could he have been winterizing? could we have been winterizing? could you have been winterizing? could they have been winterizing?

Interro-negative form

Simple form	V-ing form
could I not winterize? could you not winterize? could he not winterize? could we not winterize? could you not winterize? could they not winterize?	could I not be winterizing? could you not be winterizing? could he not be winterizing? could we not be winterizing? could you not be winterizing? could they not be winterizing?
Perfect	V-ing perfect
could I not have winterized? could you not have winterized? could he not have winterized? could we not have winterized? could you not have winterized? could they not have winterized?	could I not have been winterizing? could you not have been winterizing? could he not have been winterizing? could we not have been winterizing? could you not have been winterizing? could they not have been winterizing?