English verb conjugation
COULD COLOUR

Regular verb: colour - coloured - coloured

Affirmation

Simple form	V-ing form
I could colour you could colour he could colour we could colour you could colour they could colour	I could be colouring you could be colouring he could be colouring we could be colouring you could be colouring they could be colouring
Perfect	V-ing perfect
I could have coloured you could have coloured he could have coloured we could have coloured you could have coloured they could have coloured	I could have been colouring you could have been colouring he could have been colouring we could have been colouring you could have been colouring they could have been colouring

Negation

Simple form	V-ing form
I could not colour you could not colour he could not colour we could not colour you could not colour they could not colour	I could not be colouring you could not be colouring he could not be colouring we could not be colouring you could not be colouring they could not be colouring
Perfect	V-ing perfect
I could not have coloured you could not have coloured he could not have coloured we could not have coloured you could not have coloured they could not have coloured	I could not have been colouring you could not have been colouring he could not have been colouring we could not have been colouring you could not have been colouring they could not have been colouring

Interrogative form

Simple form	V-ing form
could I colour? could you colour? could he colour? could we colour? could you colour? could they colour?	could I be colouring? could you be colouring? could he be colouring? could we be colouring? could you be colouring? could they be colouring?
Perfect	V-ing perfect
could I have coloured? could you have coloured? could he have coloured? could we have coloured? could you have coloured? could they have coloured?	could I have been colouring? could you have been colouring? could he have been colouring? could we have been colouring? could you have been colouring? could they have been colouring?

Interro-negative form

Simple form	V-ing form
could I not colour? could you not colour? could he not colour? could we not colour? could you not colour? could they not colour?	could I not be colouring? could you not be colouring? could he not be colouring? could we not be colouring? could you not be colouring? could they not be colouring?
Perfect	V-ing perfect
could I not have coloured? could you not have coloured? could he not have coloured? could we not have coloured? could you not have coloured? could they not have coloured?	could I not have been colouring? could you not have been colouring? could he not have been colouring? could we not have been colouring? could you not have been colouring? could they not have been colouring?