English verb conjugation
MUST DISCOLOUR

Regular verb: discolour - discoloured - discoloured

Affirmation

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

Negation

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

Interrogative form

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

Interro-negative form

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