should knife
Regular verb: knife - knifed- knifed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd knife
you'd knife
she'd knife
we'd knife
you'd knife
they'd knife 	I'd be knifing
you'd be knifing
she'd be knifing
we'd be knifing
you'd be knifing
they'd be knifing	I should've knifed
you should've knifed
she should've knifed
we should've knifed
you should've knifed
they should've knifed	I should've been knifing
you should've been knifing
she should've been knifing
we should've been knifing
you should've been knifing
they should've been knifing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't knife
you shouldn't knife
she shouldn't knife
we shouldn't knife
you shouldn't knife
they shouldn't knife 	I shouldn't be knifing
you shouldn't be knifing
she shouldn't be knifing
we shouldn't be knifing
you shouldn't be knifing
they shouldn't be knifing	I shouldn't have knifed
you shouldn't have knifed
she shouldn't have knifed
we shouldn't have knifed
you shouldn't have knifed
they shouldn't have knifed	I shouldn't have been knifing
you shouldn't have been knifing
she shouldn't have been knifing
we shouldn't have been knifing
you shouldn't have been knifing
they shouldn't have been knifing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I knife?
should you knife?
should she knife?
should we knife?
should you knife?
should they knife? 	should I be knifing?
should you be knifing?
should she be knifing?
should we be knifing?
should you be knifing?
should they be knifing? 	should I have knifed?
should you have knifed?
should she have knifed?
should we have knifed?
should you have knifed?
should they have knifed? 	should I have been knifing?
should you have been knifing?
should she have been knifing?
should we have been knifing?
should you have been knifing?
should they have been knifing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I knife?
shouldn't you knife?
shouldn't she knife?
shouldn't we knife?
shouldn't you knife?
shouldn't they knife? 	shouldn't I be knifing?
shouldn't you be knifing?
shouldn't she be knifing?
shouldn't we be knifing?
shouldn't you be knifing?
shouldn't they be knifing? 	shouldn't I have knifed?
shouldn't you have knifed?
shouldn't she have knifed?
shouldn't we have knifed?
shouldn't you have knifed?
shouldn't they have knifed? 	shouldn't I have been knifing?
shouldn't you have been knifing?
shouldn't she have been knifing?
shouldn't we have been knifing?
shouldn't you have been knifing?
shouldn't they have been knifing?