English verb conjugation
MUST PROOF

Regular verb: proof - proofed - proofed

Affirmation

Simple form	V-ing form
I must proof you must proof he must proof we must proof you must proof they must proof	I must be proofing you must be proofing he must be proofing we must be proofing you must be proofing they must be proofing
Perfect	V-ing perfect
I must have proofed you must have proofed he must have proofed we must have proofed you must have proofed they must have proofed	I must have been proofing you must have been proofing he must have been proofing we must have been proofing you must have been proofing they must have been proofing

Negation

Simple form	V-ing form
I mustn't proof you mustn't proof he mustn't proof we mustn't proof you mustn't proof they mustn't proof	I mustn't be proofing you mustn't be proofing he mustn't be proofing we mustn't be proofing you mustn't be proofing they mustn't be proofing
Perfect	V-ing perfect
I mustn't have proofed you mustn't have proofed he mustn't have proofed we mustn't have proofed you mustn't have proofed they mustn't have proofed	I mustn't have been proofing you mustn't have been proofing he mustn't have been proofing we mustn't have been proofing you mustn't have been proofing they mustn't have been proofing

Interrogative form

Simple form	V-ing form
must I proof? must you proof? must he proof? must we proof? must you proof? must they proof?	must I be proofing? must you be proofing? must he be proofing? must we be proofing? must you be proofing? must they be proofing?
Perfect	V-ing perfect
must I have proofed? must you have proofed? must he have proofed? must we have proofed? must you have proofed? must they have proofed?	must I have been proofing? must you have been proofing? must he have been proofing? must we have been proofing? must you have been proofing? must they have been proofing?

Interro-negative form

Simple form	V-ing form
mustn't I proof? mustn't you proof? mustn't he proof? mustn't we proof? mustn't you proof? mustn't they proof?	mustn't I be proofing? mustn't you be proofing? mustn't he be proofing? mustn't we be proofing? mustn't you be proofing? mustn't they be proofing?
Perfect	V-ing perfect
mustn't I have proofed? mustn't you have proofed? mustn't he have proofed? mustn't we have proofed? mustn't you have proofed? mustn't they have proofed?	mustn't I have been proofing? mustn't you have been proofing? mustn't he have been proofing? mustn't we have been proofing? mustn't you have been proofing? mustn't they have been proofing?