English verb conjugation
MUST KNIFE

Regular verb: knife - knifed - knifed

Affirmation

Simple form	V-ing form
I must knife you must knife he must knife we must knife you must knife they must knife	I must be knifing you must be knifing he must be knifing we must be knifing you must be knifing they must be knifing
Perfect	V-ing perfect
I must have knifed you must have knifed he must have knifed we must have knifed you must have knifed they must have knifed	I must have been knifing you must have been knifing he must have been knifing we must have been knifing you must have been knifing they must have been knifing

Negation

Simple form	V-ing form
I mustn't knife you mustn't knife he mustn't knife we mustn't knife you mustn't knife they mustn't knife	I mustn't be knifing you mustn't be knifing he mustn't be knifing we mustn't be knifing you mustn't be knifing they mustn't be knifing
Perfect	V-ing perfect
I mustn't have knifed you mustn't have knifed he mustn't have knifed we mustn't have knifed you mustn't have knifed they mustn't have knifed	I mustn't have been knifing you mustn't have been knifing he mustn't have been knifing we mustn't have been knifing you mustn't have been knifing they mustn't have been knifing

Interrogative form

Simple form	V-ing form
must I knife? must you knife? must he knife? must we knife? must you knife? must they knife?	must I be knifing? must you be knifing? must he be knifing? must we be knifing? must you be knifing? must they be knifing?
Perfect	V-ing perfect
must I have knifed? must you have knifed? must he have knifed? must we have knifed? must you have knifed? must they have knifed?	must I have been knifing? must you have been knifing? must he have been knifing? must we have been knifing? must you have been knifing? must they have been knifing?

Interro-negative form

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