English verb conjugation
MUST MUSS

Regular verb: muss - mussed - mussed

Affirmation

Simple form	V-ing form
I must muss you must muss she must muss we must muss you must muss they must muss	I must be mussing you must be mussing she must be mussing we must be mussing you must be mussing they must be mussing
Perfect	V-ing perfect
I must have mussed you must have mussed she must have mussed we must have mussed you must have mussed they must have mussed	I must have been mussing you must have been mussing she must have been mussing we must have been mussing you must have been mussing they must have been mussing

Negation

Simple form	V-ing form
I mustn't muss you mustn't muss she mustn't muss we mustn't muss you mustn't muss they mustn't muss	I mustn't be mussing you mustn't be mussing she mustn't be mussing we mustn't be mussing you mustn't be mussing they mustn't be mussing
Perfect	V-ing perfect
I mustn't have mussed you mustn't have mussed she mustn't have mussed we mustn't have mussed you mustn't have mussed they mustn't have mussed	I mustn't have been mussing you mustn't have been mussing she mustn't have been mussing we mustn't have been mussing you mustn't have been mussing they mustn't have been mussing

Interrogative form

Simple form	V-ing form
must I muss? must you muss? must she muss? must we muss? must you muss? must they muss?	must I be mussing? must you be mussing? must she be mussing? must we be mussing? must you be mussing? must they be mussing?
Perfect	V-ing perfect
must I have mussed? must you have mussed? must she have mussed? must we have mussed? must you have mussed? must they have mussed?	must I have been mussing? must you have been mussing? must she have been mussing? must we have been mussing? must you have been mussing? must they have been mussing?

Interro-negative form

Simple form	V-ing form
mustn't I muss? mustn't you muss? mustn't she muss? mustn't we muss? mustn't you muss? mustn't they muss?	mustn't I be mussing? mustn't you be mussing? mustn't she be mussing? mustn't we be mussing? mustn't you be mussing? mustn't they be mussing?
Perfect	V-ing perfect
mustn't I have mussed? mustn't you have mussed? mustn't she have mussed? mustn't we have mussed? mustn't you have mussed? mustn't they have mussed?	mustn't I have been mussing? mustn't you have been mussing? mustn't she have been mussing? mustn't we have been mussing? mustn't you have been mussing? mustn't they have been mussing?