English verb conjugation
COULD COLOR

Regular verb: color - colored - colored

Affirmation

Simple form	V-ing form
I could color you could color he could color we could color you could color they could color	I could be coloring you could be coloring he could be coloring we could be coloring you could be coloring they could be coloring
Perfect	V-ing perfect
I could have colored you could have colored he could have colored we could have colored you could have colored they could have colored	I could have been coloring you could have been coloring he could have been coloring we could have been coloring you could have been coloring they could have been coloring

Negation

Simple form	V-ing form
I couldn't color you couldn't color he couldn't color we couldn't color you couldn't color they couldn't color	I couldn't be coloring you couldn't be coloring he couldn't be coloring we couldn't be coloring you couldn't be coloring they couldn't be coloring
Perfect	V-ing perfect
I couldn't have colored you couldn't have colored he couldn't have colored we couldn't have colored you couldn't have colored they couldn't have colored	I couldn't have been coloring you couldn't have been coloring he couldn't have been coloring we couldn't have been coloring you couldn't have been coloring they couldn't have been coloring

Interrogative form

Simple form	V-ing form
could I color? could you color? could he color? could we color? could you color? could they color?	could I be coloring? could you be coloring? could he be coloring? could we be coloring? could you be coloring? could they be coloring?
Perfect	V-ing perfect
could I have colored? could you have colored? could he have colored? could we have colored? could you have colored? could they have colored?	could I have been coloring? could you have been coloring? could he have been coloring? could we have been coloring? could you have been coloring? could they have been coloring?

Interro-negative form

Simple form	V-ing form
couldn't I color? couldn't you color? couldn't he color? couldn't we color? couldn't you color? couldn't they color?	couldn't I be coloring? couldn't you be coloring? couldn't he be coloring? couldn't we be coloring? couldn't you be coloring? couldn't they be coloring?
Perfect	V-ing perfect
couldn't I have colored? couldn't you have colored? couldn't he have colored? couldn't we have colored? couldn't you have colored? couldn't they have colored?	couldn't I have been coloring? couldn't you have been coloring? couldn't he have been coloring? couldn't we have been coloring? couldn't you have been coloring? couldn't they have been coloring?