English verb conjugation
MUST FIFE

Regular verb: fife - fifed - fifed

Affirmation

Simple form	V-ing form
I must fife you must fife he must fife we must fife you must fife they must fife	I must be fifing you must be fifing he must be fifing we must be fifing you must be fifing they must be fifing
Perfect	V-ing perfect
I must have fifed you must have fifed he must have fifed we must have fifed you must have fifed they must have fifed	I must have been fifing you must have been fifing he must have been fifing we must have been fifing you must have been fifing they must have been fifing

Negation

Simple form	V-ing form
I must not fife you must not fife he must not fife we must not fife you must not fife they must not fife	I must not be fifing you must not be fifing he must not be fifing we must not be fifing you must not be fifing they must not be fifing
Perfect	V-ing perfect
I must not have fifed you must not have fifed he must not have fifed we must not have fifed you must not have fifed they must not have fifed	I must not have been fifing you must not have been fifing he must not have been fifing we must not have been fifing you must not have been fifing they must not have been fifing

Interrogative form

Simple form	V-ing form
must I fife? must you fife? must he fife? must we fife? must you fife? must they fife?	must I be fifing? must you be fifing? must he be fifing? must we be fifing? must you be fifing? must they be fifing?
Perfect	V-ing perfect
must I have fifed? must you have fifed? must he have fifed? must we have fifed? must you have fifed? must they have fifed?	must I have been fifing? must you have been fifing? must he have been fifing? must we have been fifing? must you have been fifing? must they have been fifing?

Interro-negative form

Simple form	V-ing form
must I not fife? must you not fife? must he not fife? must we not fife? must you not fife? must they not fife?	must I not be fifing? must you not be fifing? must he not be fifing? must we not be fifing? must you not be fifing? must they not be fifing?
Perfect	V-ing perfect
must I not have fifed? must you not have fifed? must he not have fifed? must we not have fifed? must you not have fifed? must they not have fifed?	must I not have been fifing? must you not have been fifing? must he not have been fifing? must we not have been fifing? must you not have been fifing? must they not have been fifing?