English verb conjugation
MUST KNIFE

Regular verb: knife - knifed - knifed

Affirmation

Simple form	V-ing form
I must knife you must knife she must knife we must knife you must knife they must knife	I must be knifing you must be knifing she 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 she 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 she 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 must not knife you must not knife she must not knife we must not knife you must not knife they must not knife	I must not be knifing you must not be knifing she must not be knifing we must not be knifing you must not be knifing they must not be knifing
Perfect	V-ing perfect
I must not have knifed you must not have knifed she must not have knifed we must not have knifed you must not have knifed they must not have knifed	I must not have been knifing you must not have been knifing she must not have been knifing we must not have been knifing you must not have been knifing they must not have been knifing

Interrogative form

Simple form	V-ing form
must I knife? must you knife? must she knife? must we knife? must you knife? must they knife?	must I be knifing? must you be knifing? must she 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 she 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 she 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
must I not knife? must you not knife? must she not knife? must we not knife? must you not knife? must they not knife?	must I not be knifing? must you not be knifing? must she not be knifing? must we not be knifing? must you not be knifing? must they not be knifing?
Perfect	V-ing perfect
must I not have knifed? must you not have knifed? must she not have knifed? must we not have knifed? must you not have knifed? must they not have knifed?	must I not have been knifing? must you not have been knifing? must she not have been knifing? must we not have been knifing? must you not have been knifing? must they not have been knifing?