English verb conjugation
COULD STANDARDIZE

Regular verb: standardize - standardized - standardized

Affirmation

Simple form	V-ing form
I could standardize you could standardize she could standardize we could standardize you could standardize they could standardize	I could be standardizing you could be standardizing she could be standardizing we could be standardizing you could be standardizing they could be standardizing
Perfect	V-ing perfect
I could have standardized you could have standardized she could have standardized we could have standardized you could have standardized they could have standardized	I could have been standardizing you could have been standardizing she could have been standardizing we could have been standardizing you could have been standardizing they could have been standardizing

Negation

Simple form	V-ing form
I couldn't standardize you couldn't standardize she couldn't standardize we couldn't standardize you couldn't standardize they couldn't standardize	I couldn't be standardizing you couldn't be standardizing she couldn't be standardizing we couldn't be standardizing you couldn't be standardizing they couldn't be standardizing
Perfect	V-ing perfect
I couldn't have standardized you couldn't have standardized she couldn't have standardized we couldn't have standardized you couldn't have standardized they couldn't have standardized	I couldn't have been standardizing you couldn't have been standardizing she couldn't have been standardizing we couldn't have been standardizing you couldn't have been standardizing they couldn't have been standardizing

Interrogative form

Simple form	V-ing form
could I standardize? could you standardize? could she standardize? could we standardize? could you standardize? could they standardize?	could I be standardizing? could you be standardizing? could she be standardizing? could we be standardizing? could you be standardizing? could they be standardizing?
Perfect	V-ing perfect
could I have standardized? could you have standardized? could she have standardized? could we have standardized? could you have standardized? could they have standardized?	could I have been standardizing? could you have been standardizing? could she have been standardizing? could we have been standardizing? could you have been standardizing? could they have been standardizing?

Interro-negative form

Simple form	V-ing form
couldn't I standardize? couldn't you standardize? couldn't she standardize? couldn't we standardize? couldn't you standardize? couldn't they standardize?	couldn't I be standardizing? couldn't you be standardizing? couldn't she be standardizing? couldn't we be standardizing? couldn't you be standardizing? couldn't they be standardizing?
Perfect	V-ing perfect
couldn't I have standardized? couldn't you have standardized? couldn't she have standardized? couldn't we have standardized? couldn't you have standardized? couldn't they have standardized?	couldn't I have been standardizing? couldn't you have been standardizing? couldn't she have been standardizing? couldn't we have been standardizing? couldn't you have been standardizing? couldn't they have been standardizing?