should discolour
Regular verb: discolour - discoloured- discoloured

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd discolour
you'd discolour
she'd discolour
we'd discolour
you'd discolour
they'd discolour 	I'd be discolouring
you'd be discolouring
she'd be discolouring
we'd be discolouring
you'd be discolouring
they'd be discolouring	I should've discoloured
you should've discoloured
she should've discoloured
we should've discoloured
you should've discoloured
they should've discoloured	I should've been discolouring
you should've been discolouring
she should've been discolouring
we should've been discolouring
you should've been discolouring
they should've been discolouring	

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

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

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