English verb conjugation
COULD KO

Regular verb: ko - koed - koed

Affirmation

Simple form	V-ing form
I could ko you could ko she could ko we could ko you could ko they could ko	I could be koing you could be koing she could be koing we could be koing you could be koing they could be koing
Perfect	V-ing perfect
I could have koed you could have koed she could have koed we could have koed you could have koed they could have koed	I could have been koing you could have been koing she could have been koing we could have been koing you could have been koing they could have been koing

Negation

Simple form	V-ing form
I couldn't ko you couldn't ko she couldn't ko we couldn't ko you couldn't ko they couldn't ko	I couldn't be koing you couldn't be koing she couldn't be koing we couldn't be koing you couldn't be koing they couldn't be koing
Perfect	V-ing perfect
I couldn't have koed you couldn't have koed she couldn't have koed we couldn't have koed you couldn't have koed they couldn't have koed	I couldn't have been koing you couldn't have been koing she couldn't have been koing we couldn't have been koing you couldn't have been koing they couldn't have been koing

Interrogative form

Simple form	V-ing form
could I ko? could you ko? could she ko? could we ko? could you ko? could they ko?	could I be koing? could you be koing? could she be koing? could we be koing? could you be koing? could they be koing?
Perfect	V-ing perfect
could I have koed? could you have koed? could she have koed? could we have koed? could you have koed? could they have koed?	could I have been koing? could you have been koing? could she have been koing? could we have been koing? could you have been koing? could they have been koing?

Interro-negative form

Simple form	V-ing form
couldn't I ko? couldn't you ko? couldn't she ko? couldn't we ko? couldn't you ko? couldn't they ko?	couldn't I be koing? couldn't you be koing? couldn't she be koing? couldn't we be koing? couldn't you be koing? couldn't they be koing?
Perfect	V-ing perfect
couldn't I have koed? couldn't you have koed? couldn't she have koed? couldn't we have koed? couldn't you have koed? couldn't they have koed?	couldn't I have been koing? couldn't you have been koing? couldn't she have been koing? couldn't we have been koing? couldn't you have been koing? couldn't they have been koing?