English verb conjugation
COULD BLUE

Regular verb: blue - blued - blued

Affirmation

Simple form	V-ing form
I could blue you could blue he could blue we could blue you could blue they could blue	I could be bluing you could be bluing he could be bluing we could be bluing you could be bluing they could be bluing
Perfect	V-ing perfect
I could have blued you could have blued he could have blued we could have blued you could have blued they could have blued	I could have been bluing you could have been bluing he could have been bluing we could have been bluing you could have been bluing they could have been bluing

Negation

Simple form	V-ing form
I couldn't blue you couldn't blue he couldn't blue we couldn't blue you couldn't blue they couldn't blue	I couldn't be bluing you couldn't be bluing he couldn't be bluing we couldn't be bluing you couldn't be bluing they couldn't be bluing
Perfect	V-ing perfect
I couldn't have blued you couldn't have blued he couldn't have blued we couldn't have blued you couldn't have blued they couldn't have blued	I couldn't have been bluing you couldn't have been bluing he couldn't have been bluing we couldn't have been bluing you couldn't have been bluing they couldn't have been bluing

Interrogative form

Simple form	V-ing form
could I blue? could you blue? could he blue? could we blue? could you blue? could they blue?	could I be bluing? could you be bluing? could he be bluing? could we be bluing? could you be bluing? could they be bluing?
Perfect	V-ing perfect
could I have blued? could you have blued? could he have blued? could we have blued? could you have blued? could they have blued?	could I have been bluing? could you have been bluing? could he have been bluing? could we have been bluing? could you have been bluing? could they have been bluing?

Interro-negative form

Simple form	V-ing form
couldn't I blue? couldn't you blue? couldn't he blue? couldn't we blue? couldn't you blue? couldn't they blue?	couldn't I be bluing? couldn't you be bluing? couldn't he be bluing? couldn't we be bluing? couldn't you be bluing? couldn't they be bluing?
Perfect	V-ing perfect
couldn't I have blued? couldn't you have blued? couldn't he have blued? couldn't we have blued? couldn't you have blued? couldn't they have blued?	couldn't I have been bluing? couldn't you have been bluing? couldn't he have been bluing? couldn't we have been bluing? couldn't you have been bluing? couldn't they have been bluing?