I could standardize you could standardize he could standardize we could standardize you could standardize they could standardize
V-ing form
I could be standardizing you could be standardizing he could be standardizing we could be standardizing you could be standardizing they could be standardizing
Perfect
I could have standardized you could have standardized he could have standardized we could have standardized you could have standardized they could have standardized
V-ing perfect
I could have been standardizing you could have been standardizing he could have been standardizing we could have been standardizing you could have been standardizing they could have been standardizing
Negation
Simple form
I could not standardize you could not standardize he could not standardize we could not standardize you could not standardize they could not standardize
V-ing form
I could not be standardizing you could not be standardizing he could not be standardizing we could not be standardizing you could not be standardizing they could not be standardizing
Perfect
I could not have standardized you could not have standardized he could not have standardized we could not have standardized you could not have standardized they could not have standardized
V-ing perfect
I could not have been standardizing you could not have been standardizing he could not have been standardizing we could not have been standardizing you could not have been standardizing they could not have been standardizing
Interrogative form
Simple form
could I standardize? could you standardize? could he standardize? could we standardize? could you standardize? could they standardize?
V-ing form
could I be standardizing? could you be standardizing? could he be standardizing? could we be standardizing? could you be standardizing? could they be standardizing?
Perfect
could I have standardized? could you have standardized? could he have standardized? could we have standardized? could you have standardized? could they have standardized?
V-ing perfect
could I have been standardizing? could you have been standardizing? could he have been standardizing? could we have been standardizing? could you have been standardizing? could they have been standardizing?
Interro-negative form
Simple form
could I not standardize? could you not standardize? could he not standardize? could we not standardize? could you not standardize? could they not standardize?
V-ing form
could I not be standardizing? could you not be standardizing? could he not be standardizing? could we not be standardizing? could you not be standardizing? could they not be standardizing?
Perfect
could I not have standardized? could you not have standardized? could he not have standardized? could we not have standardized? could you not have standardized? could they not have standardized?
V-ing perfect
could I not have been standardizing? could you not have been standardizing? could he not have been standardizing? could we not have been standardizing? could you not have been standardizing? could they not have been standardizing?