must fireproof
Regular verb: fireproof - fireproofed- fireproofed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must fireproof
you must fireproof
he must fireproof
we must fireproof
you must fireproof
they must fireproof 	I must be fireproofing
you must be fireproofing
he must be fireproofing
we must be fireproofing
you must be fireproofing
they must be fireproofing	I must have fireproofed
you must have fireproofed
he must have fireproofed
we must have fireproofed
you must have fireproofed
they must have fireproofed	I must have been fireproofing
you must have been fireproofing
he must have been fireproofing
we must have been fireproofing
you must have been fireproofing
they must have been fireproofing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not fireproof
you must not fireproof
he must not fireproof
we must not fireproof
you must not fireproof
they must not fireproof 	I must not be fireproofing
you must not be fireproofing
he must not be fireproofing
we must not be fireproofing
you must not be fireproofing
they must not be fireproofing	I must not have fireproofed
you must not have fireproofed
he must not have fireproofed
we must not have fireproofed
you must not have fireproofed
they must not have fireproofed	I must not have been fireproofing
you must not have been fireproofing
he must not have been fireproofing
we must not have been fireproofing
you must not have been fireproofing
they must not have been fireproofing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I fireproof?
must you fireproof?
must he fireproof?
must we fireproof?
must you fireproof?
must they fireproof? 	must I be fireproofing?
must you be fireproofing?
must he be fireproofing?
must we be fireproofing?
must you be fireproofing?
must they be fireproofing? 	must I have fireproofed?
must you have fireproofed?
must he have fireproofed?
must we have fireproofed?
must you have fireproofed?
must they have fireproofed? 	must I have been fireproofing?
must you have been fireproofing?
must he have been fireproofing?
must we have been fireproofing?
must you have been fireproofing?
must they have been fireproofing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not fireproof?
must you not fireproof?
must he not fireproof?
must we not fireproof?
must you not fireproof?
must they not fireproof? 	must I not be fireproofing?
must you not be fireproofing?
must he not be fireproofing?
must we not be fireproofing?
must you not be fireproofing?
must they not be fireproofing? 	must I not have fireproofed?
must you not have fireproofed?
must he not have fireproofed?
must we not have fireproofed?
must you not have fireproofed?
must they not have fireproofed? 	must I not have been fireproofing?
must you not have been fireproofing?
must he not have been fireproofing?
must we not have been fireproofing?
must you not have been fireproofing?
must they not have been fireproofing?