should knife
Verbo regular: knife - knifed- knifed

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I'd knife
you'd knife
he'd knife
we'd knife
you'd knife
they'd knife 	I'd be knifing
you'd be knifing
he'd be knifing
we'd be knifing
you'd be knifing
they'd be knifing	I should've knifed
you should've knifed
he 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
he should've been knifing
we should've been knifing
you should've been knifing
they should've been knifing	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I shouldn't knife
you shouldn't knife
he 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
he 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
he 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
he shouldn't have been knifing
we shouldn't have been knifing
you shouldn't have been knifing
they shouldn't have been knifing	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
should I knife?
should you knife?
should he knife?
should we knife?
should you knife?
should they knife? 	should I be knifing?
should you be knifing?
should he be knifing?
should we be knifing?
should you be knifing?
should they be knifing? 	should I have knifed?
should you have knifed?
should he 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 he have been knifing?
should we have been knifing?
should you have been knifing?
should they have been knifing? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
shouldn't I knife?
shouldn't you knife?
shouldn't he 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 he 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 he 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 he have been knifing?
shouldn't we have been knifing?
shouldn't you have been knifing?
shouldn't they have been knifing?