I must suffice you must suffice she must suffice we must suffice you must suffice they must suffice
V-ing form
I must be sufficing you must be sufficing she must be sufficing we must be sufficing you must be sufficing they must be sufficing
Perfect
I must have sufficed you must have sufficed she must have sufficed we must have sufficed you must have sufficed they must have sufficed
V-ing perfect
I must have been sufficing you must have been sufficing she must have been sufficing we must have been sufficing you must have been sufficing they must have been sufficing
Negation
Simple form
I mustn't suffice you mustn't suffice she mustn't suffice we mustn't suffice you mustn't suffice they mustn't suffice
V-ing form
I mustn't be sufficing you mustn't be sufficing she mustn't be sufficing we mustn't be sufficing you mustn't be sufficing they mustn't be sufficing
Perfect
I mustn't have sufficed you mustn't have sufficed she mustn't have sufficed we mustn't have sufficed you mustn't have sufficed they mustn't have sufficed
V-ing perfect
I mustn't have been sufficing you mustn't have been sufficing she mustn't have been sufficing we mustn't have been sufficing you mustn't have been sufficing they mustn't have been sufficing
Interrogative form
Simple form
must I suffice? must you suffice? must she suffice? must we suffice? must you suffice? must they suffice?
V-ing form
must I be sufficing? must you be sufficing? must she be sufficing? must we be sufficing? must you be sufficing? must they be sufficing?
Perfect
must I have sufficed? must you have sufficed? must she have sufficed? must we have sufficed? must you have sufficed? must they have sufficed?
V-ing perfect
must I have been sufficing? must you have been sufficing? must she have been sufficing? must we have been sufficing? must you have been sufficing? must they have been sufficing?
Interro-negative form
Simple form
mustn't I suffice? mustn't you suffice? mustn't she suffice? mustn't we suffice? mustn't you suffice? mustn't they suffice?
V-ing form
mustn't I be sufficing? mustn't you be sufficing? mustn't she be sufficing? mustn't we be sufficing? mustn't you be sufficing? mustn't they be sufficing?
Perfect
mustn't I have sufficed? mustn't you have sufficed? mustn't she have sufficed? mustn't we have sufficed? mustn't you have sufficed? mustn't they have sufficed?
V-ing perfect
mustn't I have been sufficing? mustn't you have been sufficing? mustn't she have been sufficing? mustn't we have been sufficing? mustn't you have been sufficing? mustn't they have been sufficing?