should knacker
Regular verb: knacker - knackered- knackered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd knacker
you'd knacker
he'd knacker
we'd knacker
you'd knacker
they'd knacker 	I'd be knackering
you'd be knackering
he'd be knackering
we'd be knackering
you'd be knackering
they'd be knackering	I should've knackered
you should've knackered
he should've knackered
we should've knackered
you should've knackered
they should've knackered	I should've been knackering
you should've been knackering
he should've been knackering
we should've been knackering
you should've been knackering
they should've been knackering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't knacker
you shouldn't knacker
he shouldn't knacker
we shouldn't knacker
you shouldn't knacker
they shouldn't knacker 	I shouldn't be knackering
you shouldn't be knackering
he shouldn't be knackering
we shouldn't be knackering
you shouldn't be knackering
they shouldn't be knackering	I shouldn't have knackered
you shouldn't have knackered
he shouldn't have knackered
we shouldn't have knackered
you shouldn't have knackered
they shouldn't have knackered	I shouldn't have been knackering
you shouldn't have been knackering
he shouldn't have been knackering
we shouldn't have been knackering
you shouldn't have been knackering
they shouldn't have been knackering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I knacker?
should you knacker?
should he knacker?
should we knacker?
should you knacker?
should they knacker? 	should I be knackering?
should you be knackering?
should he be knackering?
should we be knackering?
should you be knackering?
should they be knackering? 	should I have knackered?
should you have knackered?
should he have knackered?
should we have knackered?
should you have knackered?
should they have knackered? 	should I have been knackering?
should you have been knackering?
should he have been knackering?
should we have been knackering?
should you have been knackering?
should they have been knackering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I knacker?
shouldn't you knacker?
shouldn't he knacker?
shouldn't we knacker?
shouldn't you knacker?
shouldn't they knacker? 	shouldn't I be knackering?
shouldn't you be knackering?
shouldn't he be knackering?
shouldn't we be knackering?
shouldn't you be knackering?
shouldn't they be knackering? 	shouldn't I have knackered?
shouldn't you have knackered?
shouldn't he have knackered?
shouldn't we have knackered?
shouldn't you have knackered?
shouldn't they have knackered? 	shouldn't I have been knackering?
shouldn't you have been knackering?
shouldn't he have been knackering?
shouldn't we have been knackering?
shouldn't you have been knackering?
shouldn't they have been knackering?