must proof
Verbo regular: proof - proofed- proofed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must proof
you must proof
she must proof
we must proof
you must proof
they must proof 	I must be proofing
you must be proofing
she must be proofing
we must be proofing
you must be proofing
they must be proofing	I must have proofed
you must have proofed
she 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
she must have been proofing
we must have been proofing
you must have been proofing
they must have been proofing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not proof
you must not proof
she must not proof
we must not proof
you must not proof
they must not proof 	I must not be proofing
you must not be proofing
she must not be proofing
we must not be proofing
you must not be proofing
they must not be proofing	I must not have proofed
you must not have proofed
she must not have proofed
we must not have proofed
you must not have proofed
they must not have proofed	I must not have been proofing
you must not have been proofing
she must not have been proofing
we must not have been proofing
you must not have been proofing
they must not have been proofing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I proof?
must you proof?
must she proof?
must we proof?
must you proof?
must they proof? 	must I be proofing?
must you be proofing?
must she be proofing?
must we be proofing?
must you be proofing?
must they be proofing? 	must I have proofed?
must you have proofed?
must she 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 she have been proofing?
must we have been proofing?
must you have been proofing?
must they have been proofing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not proof?
must you not proof?
must she not proof?
must we not proof?
must you not proof?
must they not proof? 	must I not be proofing?
must you not be proofing?
must she not be proofing?
must we not be proofing?
must you not be proofing?
must they not be proofing? 	must I not have proofed?
must you not have proofed?
must she not have proofed?
must we not have proofed?
must you not have proofed?
must they not have proofed? 	must I not have been proofing?
must you not have been proofing?
must she not have been proofing?
must we not have been proofing?
must you not have been proofing?
must they not have been proofing?