English verb conjugation
MUST CONCUSS

Regular verb: concuss - concussed - concussed

Affirmation

Simple form	V-ing form
I must concuss you must concuss she must concuss we must concuss you must concuss they must concuss	I must be concussing you must be concussing she must be concussing we must be concussing you must be concussing they must be concussing
Perfect	V-ing perfect
I must have concussed you must have concussed she must have concussed we must have concussed you must have concussed they must have concussed	I must have been concussing you must have been concussing she must have been concussing we must have been concussing you must have been concussing they must have been concussing

Negation

Simple form	V-ing form
I mustn't concuss you mustn't concuss she mustn't concuss we mustn't concuss you mustn't concuss they mustn't concuss	I mustn't be concussing you mustn't be concussing she mustn't be concussing we mustn't be concussing you mustn't be concussing they mustn't be concussing
Perfect	V-ing perfect
I mustn't have concussed you mustn't have concussed she mustn't have concussed we mustn't have concussed you mustn't have concussed they mustn't have concussed	I mustn't have been concussing you mustn't have been concussing she mustn't have been concussing we mustn't have been concussing you mustn't have been concussing they mustn't have been concussing

Interrogative form

Simple form	V-ing form
must I concuss? must you concuss? must she concuss? must we concuss? must you concuss? must they concuss?	must I be concussing? must you be concussing? must she be concussing? must we be concussing? must you be concussing? must they be concussing?
Perfect	V-ing perfect
must I have concussed? must you have concussed? must she have concussed? must we have concussed? must you have concussed? must they have concussed?	must I have been concussing? must you have been concussing? must she have been concussing? must we have been concussing? must you have been concussing? must they have been concussing?

Interro-negative form

Simple form	V-ing form
mustn't I concuss? mustn't you concuss? mustn't she concuss? mustn't we concuss? mustn't you concuss? mustn't they concuss?	mustn't I be concussing? mustn't you be concussing? mustn't she be concussing? mustn't we be concussing? mustn't you be concussing? mustn't they be concussing?
Perfect	V-ing perfect
mustn't I have concussed? mustn't you have concussed? mustn't she have concussed? mustn't we have concussed? mustn't you have concussed? mustn't they have concussed?	mustn't I have been concussing? mustn't you have been concussing? mustn't she have been concussing? mustn't we have been concussing? mustn't you have been concussing? mustn't they have been concussing?