English verb conjugation
COULD DISCOLOUR

Regular verb: discolour - discoloured - discoloured

Affirmation

Simple form	V-ing form
I could discolour you could discolour she could discolour we could discolour you could discolour they could discolour	I could be discolouring you could be discolouring she could be discolouring we could be discolouring you could be discolouring they could be discolouring
Perfect	V-ing perfect
I could have discoloured you could have discoloured she could have discoloured we could have discoloured you could have discoloured they could have discoloured	I could have been discolouring you could have been discolouring she could have been discolouring we could have been discolouring you could have been discolouring they could have been discolouring

Negation

Simple form	V-ing form
I couldn't discolour you couldn't discolour she couldn't discolour we couldn't discolour you couldn't discolour they couldn't discolour	I couldn't be discolouring you couldn't be discolouring she couldn't be discolouring we couldn't be discolouring you couldn't be discolouring they couldn't be discolouring
Perfect	V-ing perfect
I couldn't have discoloured you couldn't have discoloured she couldn't have discoloured we couldn't have discoloured you couldn't have discoloured they couldn't have discoloured	I couldn't have been discolouring you couldn't have been discolouring she couldn't have been discolouring we couldn't have been discolouring you couldn't have been discolouring they couldn't have been discolouring

Interrogative form

Simple form	V-ing form
could I discolour? could you discolour? could she discolour? could we discolour? could you discolour? could they discolour?	could I be discolouring? could you be discolouring? could she be discolouring? could we be discolouring? could you be discolouring? could they be discolouring?
Perfect	V-ing perfect
could I have discoloured? could you have discoloured? could she have discoloured? could we have discoloured? could you have discoloured? could they have discoloured?	could I have been discolouring? could you have been discolouring? could she have been discolouring? could we have been discolouring? could you have been discolouring? could they have been discolouring?

Interro-negative form

Simple form	V-ing form
couldn't I discolour? couldn't you discolour? couldn't she discolour? couldn't we discolour? couldn't you discolour? couldn't they discolour?	couldn't I be discolouring? couldn't you be discolouring? couldn't she be discolouring? couldn't we be discolouring? couldn't you be discolouring? couldn't they be discolouring?
Perfect	V-ing perfect
couldn't I have discoloured? couldn't you have discoloured? couldn't she have discoloured? couldn't we have discoloured? couldn't you have discoloured? couldn't they have discoloured?	couldn't I have been discolouring? couldn't you have been discolouring? couldn't she have been discolouring? couldn't we have been discolouring? couldn't you have been discolouring? couldn't they have been discolouring?