English verb conjugation
SHOULD KNIFE

Regular verb: knife - knifed - knifed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?