English verb conjugation
COULD PAINT

Regular verb: paint - painted - painted

Affirmation

Simple form	V-ing form
I could paint you could paint he could paint we could paint you could paint they could paint	I could be painting you could be painting he could be painting we could be painting you could be painting they could be painting
Perfect	V-ing perfect
I could have painted you could have painted he could have painted we could have painted you could have painted they could have painted	I could have been painting you could have been painting he could have been painting we could have been painting you could have been painting they could have been painting

Negation

Simple form	V-ing form
I couldn't paint you couldn't paint he couldn't paint we couldn't paint you couldn't paint they couldn't paint	I couldn't be painting you couldn't be painting he couldn't be painting we couldn't be painting you couldn't be painting they couldn't be painting
Perfect	V-ing perfect
I couldn't have painted you couldn't have painted he couldn't have painted we couldn't have painted you couldn't have painted they couldn't have painted	I couldn't have been painting you couldn't have been painting he couldn't have been painting we couldn't have been painting you couldn't have been painting they couldn't have been painting

Interrogative form

Simple form	V-ing form
could I paint? could you paint? could he paint? could we paint? could you paint? could they paint?	could I be painting? could you be painting? could he be painting? could we be painting? could you be painting? could they be painting?
Perfect	V-ing perfect
could I have painted? could you have painted? could he have painted? could we have painted? could you have painted? could they have painted?	could I have been painting? could you have been painting? could he have been painting? could we have been painting? could you have been painting? could they have been painting?

Interro-negative form

Simple form	V-ing form
couldn't I paint? couldn't you paint? couldn't he paint? couldn't we paint? couldn't you paint? couldn't they paint?	couldn't I be painting? couldn't you be painting? couldn't he be painting? couldn't we be painting? couldn't you be painting? couldn't they be painting?
Perfect	V-ing perfect
couldn't I have painted? couldn't you have painted? couldn't he have painted? couldn't we have painted? couldn't you have painted? couldn't they have painted?	couldn't I have been painting? couldn't you have been painting? couldn't he have been painting? couldn't we have been painting? couldn't you have been painting? couldn't they have been painting?