English verb conjugation
MUST FOUI

Regular verb: foui - fouied - fouied

Affirmation

Simple form	V-ing form
I must foui you must foui he must foui we must foui you must foui they must foui	I must be fouiing you must be fouiing he 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 he 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 he 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 he 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 he 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 he 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 he 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 he foui? must we foui? must you foui? must they foui?	must I be fouiing? must you be fouiing? must he 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 he 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 he 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 he 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 he 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 he 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 he have been fouiing? mustn't we have been fouiing? mustn't you have been fouiing? mustn't they have been fouiing?