English verb conjugation
COULD CHARACTERIZE

Regular verb: characterize - characterized - characterized

Affirmation

Simple form	V-ing form
I could characterize you could characterize she could characterize we could characterize you could characterize they could characterize	I could be characterizing you could be characterizing she could be characterizing we could be characterizing you could be characterizing they could be characterizing
Perfect	V-ing perfect
I could have characterized you could have characterized she could have characterized we could have characterized you could have characterized they could have characterized	I could have been characterizing you could have been characterizing she could have been characterizing we could have been characterizing you could have been characterizing they could have been characterizing

Negation

Simple form	V-ing form
I couldn't characterize you couldn't characterize she couldn't characterize we couldn't characterize you couldn't characterize they couldn't characterize	I couldn't be characterizing you couldn't be characterizing she couldn't be characterizing we couldn't be characterizing you couldn't be characterizing they couldn't be characterizing
Perfect	V-ing perfect
I couldn't have characterized you couldn't have characterized she couldn't have characterized we couldn't have characterized you couldn't have characterized they couldn't have characterized	I couldn't have been characterizing you couldn't have been characterizing she couldn't have been characterizing we couldn't have been characterizing you couldn't have been characterizing they couldn't have been characterizing

Interrogative form

Simple form	V-ing form
could I characterize? could you characterize? could she characterize? could we characterize? could you characterize? could they characterize?	could I be characterizing? could you be characterizing? could she be characterizing? could we be characterizing? could you be characterizing? could they be characterizing?
Perfect	V-ing perfect
could I have characterized? could you have characterized? could she have characterized? could we have characterized? could you have characterized? could they have characterized?	could I have been characterizing? could you have been characterizing? could she have been characterizing? could we have been characterizing? could you have been characterizing? could they have been characterizing?

Interro-negative form

Simple form	V-ing form
couldn't I characterize? couldn't you characterize? couldn't she characterize? couldn't we characterize? couldn't you characterize? couldn't they characterize?	couldn't I be characterizing? couldn't you be characterizing? couldn't she be characterizing? couldn't we be characterizing? couldn't you be characterizing? couldn't they be characterizing?
Perfect	V-ing perfect
couldn't I have characterized? couldn't you have characterized? couldn't she have characterized? couldn't we have characterized? couldn't you have characterized? couldn't they have characterized?	couldn't I have been characterizing? couldn't you have been characterizing? couldn't she have been characterizing? couldn't we have been characterizing? couldn't you have been characterizing? couldn't they have been characterizing?