must proof
Regular verb: proof - proofed- proofed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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	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 	Perfect 	V-ing perfect 	
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? 	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 	Perfect 	V-ing perfect 	
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? 	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?