English verb conjugation
OUGHT TO KNIFE

Regular verb: knife - knifed - knifed

Affirmation

Simple form	V-ing form
I ought to knife you ought to knife she ought to knife we ought to knife you ought to knife they ought to knife	I ought to be knifing you ought to be knifing she ought to be knifing we ought to be knifing you ought to be knifing they ought to be knifing
Perfect	V-ing perfect
I ought to have knifed you ought to have knifed she ought to have knifed we ought to have knifed you ought to have knifed they ought to have knifed	I ought to have been knifing you ought to have been knifing she ought to have been knifing we ought to have been knifing you ought to have been knifing they ought to have been knifing

Negation

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

Interrogative form

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

Interro-negative form

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