English verb conjugation
MUST FOUI

Regular verb: foui - fouied - fouied

Affirmation

Simple form	V-ing form
I must foui you must foui she must foui we must foui you must foui they must foui	I must be fouiing you must be fouiing she must be fouiing we must be fouiing you must be fouiing they must be fouiing
Perfect	V-ing perfect
I must have fouied you must have fouied she must have fouied we must have fouied you must have fouied they must have fouied	I must have been fouiing you must have been fouiing she must have been fouiing we must have been fouiing you must have been fouiing they must have been fouiing

Negation

Simple form	V-ing form
I mustn't foui you mustn't foui she mustn't foui we mustn't foui you mustn't foui they mustn't foui	I mustn't be fouiing you mustn't be fouiing she mustn't be fouiing we mustn't be fouiing you mustn't be fouiing they mustn't be fouiing
Perfect	V-ing perfect
I mustn't have fouied you mustn't have fouied she mustn't have fouied we mustn't have fouied you mustn't have fouied they mustn't have fouied	I mustn't have been fouiing you mustn't have been fouiing she mustn't have been fouiing we mustn't have been fouiing you mustn't have been fouiing they mustn't have been fouiing

Interrogative form

Simple form	V-ing form
must I foui? must you foui? must she foui? must we foui? must you foui? must they foui?	must I be fouiing? must you be fouiing? must she be fouiing? must we be fouiing? must you be fouiing? must they be fouiing?
Perfect	V-ing perfect
must I have fouied? must you have fouied? must she have fouied? must we have fouied? must you have fouied? must they have fouied?	must I have been fouiing? must you have been fouiing? must she have been fouiing? must we have been fouiing? must you have been fouiing? must they have been fouiing?

Interro-negative form

Simple form	V-ing form
mustn't I foui? mustn't you foui? mustn't she foui? mustn't we foui? mustn't you foui? mustn't they foui?	mustn't I be fouiing? mustn't you be fouiing? mustn't she be fouiing? mustn't we be fouiing? mustn't you be fouiing? mustn't they be fouiing?
Perfect	V-ing perfect
mustn't I have fouied? mustn't you have fouied? mustn't she have fouied? mustn't we have fouied? mustn't you have fouied? mustn't they have fouied?	mustn't I have been fouiing? mustn't you have been fouiing? mustn't she have been fouiing? mustn't we have been fouiing? mustn't you have been fouiing? mustn't they have been fouiing?