should canker
Regular verb: canker - cankered- cankered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd canker
you'd canker
he'd canker
we'd canker
you'd canker
they'd canker 	I'd be cankering
you'd be cankering
he'd be cankering
we'd be cankering
you'd be cankering
they'd be cankering	I should've cankered
you should've cankered
he should've cankered
we should've cankered
you should've cankered
they should've cankered	I should've been cankering
you should've been cankering
he should've been cankering
we should've been cankering
you should've been cankering
they should've been cankering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't canker
you shouldn't canker
he shouldn't canker
we shouldn't canker
you shouldn't canker
they shouldn't canker 	I shouldn't be cankering
you shouldn't be cankering
he shouldn't be cankering
we shouldn't be cankering
you shouldn't be cankering
they shouldn't be cankering	I shouldn't have cankered
you shouldn't have cankered
he shouldn't have cankered
we shouldn't have cankered
you shouldn't have cankered
they shouldn't have cankered	I shouldn't have been cankering
you shouldn't have been cankering
he shouldn't have been cankering
we shouldn't have been cankering
you shouldn't have been cankering
they shouldn't have been cankering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I canker?
should you canker?
should he canker?
should we canker?
should you canker?
should they canker? 	should I be cankering?
should you be cankering?
should he be cankering?
should we be cankering?
should you be cankering?
should they be cankering? 	should I have cankered?
should you have cankered?
should he have cankered?
should we have cankered?
should you have cankered?
should they have cankered? 	should I have been cankering?
should you have been cankering?
should he have been cankering?
should we have been cankering?
should you have been cankering?
should they have been cankering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I canker?
shouldn't you canker?
shouldn't he canker?
shouldn't we canker?
shouldn't you canker?
shouldn't they canker? 	shouldn't I be cankering?
shouldn't you be cankering?
shouldn't he be cankering?
shouldn't we be cankering?
shouldn't you be cankering?
shouldn't they be cankering? 	shouldn't I have cankered?
shouldn't you have cankered?
shouldn't he have cankered?
shouldn't we have cankered?
shouldn't you have cankered?
shouldn't they have cankered? 	shouldn't I have been cankering?
shouldn't you have been cankering?
shouldn't he have been cankering?
shouldn't we have been cankering?
shouldn't you have been cankering?
shouldn't they have been cankering?