English verb conjugation
COULD SYSTEMATIZE

Regular verb: systematize - systematized - systematized

Affirmation

Simple form	V-ing form
I could systematize you could systematize he could systematize we could systematize you could systematize they could systematize	I could be systematizing you could be systematizing he could be systematizing we could be systematizing you could be systematizing they could be systematizing
Perfect	V-ing perfect
I could have systematized you could have systematized he could have systematized we could have systematized you could have systematized they could have systematized	I could have been systematizing you could have been systematizing he could have been systematizing we could have been systematizing you could have been systematizing they could have been systematizing

Negation

Simple form	V-ing form
I couldn't systematize you couldn't systematize he couldn't systematize we couldn't systematize you couldn't systematize they couldn't systematize	I couldn't be systematizing you couldn't be systematizing he couldn't be systematizing we couldn't be systematizing you couldn't be systematizing they couldn't be systematizing
Perfect	V-ing perfect
I couldn't have systematized you couldn't have systematized he couldn't have systematized we couldn't have systematized you couldn't have systematized they couldn't have systematized	I couldn't have been systematizing you couldn't have been systematizing he couldn't have been systematizing we couldn't have been systematizing you couldn't have been systematizing they couldn't have been systematizing

Interrogative form

Simple form	V-ing form
could I systematize? could you systematize? could he systematize? could we systematize? could you systematize? could they systematize?	could I be systematizing? could you be systematizing? could he be systematizing? could we be systematizing? could you be systematizing? could they be systematizing?
Perfect	V-ing perfect
could I have systematized? could you have systematized? could he have systematized? could we have systematized? could you have systematized? could they have systematized?	could I have been systematizing? could you have been systematizing? could he have been systematizing? could we have been systematizing? could you have been systematizing? could they have been systematizing?

Interro-negative form

Simple form	V-ing form
couldn't I systematize? couldn't you systematize? couldn't he systematize? couldn't we systematize? couldn't you systematize? couldn't they systematize?	couldn't I be systematizing? couldn't you be systematizing? couldn't he be systematizing? couldn't we be systematizing? couldn't you be systematizing? couldn't they be systematizing?
Perfect	V-ing perfect
couldn't I have systematized? couldn't you have systematized? couldn't he have systematized? couldn't we have systematized? couldn't you have systematized? couldn't they have systematized?	couldn't I have been systematizing? couldn't you have been systematizing? couldn't he have been systematizing? couldn't we have been systematizing? couldn't you have been systematizing? couldn't they have been systematizing?