English verb conjugation
MUST FIFE

Regular verb: fife - fifed - fifed

Affirmation

Simple form	V-ing form
I must fife you must fife she must fife we must fife you must fife they must fife	I must be fifing you must be fifing she 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 she 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 she 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 mustn't fife you mustn't fife she mustn't fife we mustn't fife you mustn't fife they mustn't fife	I mustn't be fifing you mustn't be fifing she mustn't be fifing we mustn't be fifing you mustn't be fifing they mustn't be fifing
Perfect	V-ing perfect
I mustn't have fifed you mustn't have fifed she mustn't have fifed we mustn't have fifed you mustn't have fifed they mustn't have fifed	I mustn't have been fifing you mustn't have been fifing she mustn't have been fifing we mustn't have been fifing you mustn't have been fifing they mustn't have been fifing

Interrogative form

Simple form	V-ing form
must I fife? must you fife? must she fife? must we fife? must you fife? must they fife?	must I be fifing? must you be fifing? must she 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 she 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 she 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
mustn't I fife? mustn't you fife? mustn't she fife? mustn't we fife? mustn't you fife? mustn't they fife?	mustn't I be fifing? mustn't you be fifing? mustn't she be fifing? mustn't we be fifing? mustn't you be fifing? mustn't they be fifing?
Perfect	V-ing perfect
mustn't I have fifed? mustn't you have fifed? mustn't she have fifed? mustn't we have fifed? mustn't you have fifed? mustn't they have fifed?	mustn't I have been fifing? mustn't you have been fifing? mustn't she have been fifing? mustn't we have been fifing? mustn't you have been fifing? mustn't they have been fifing?