could fireproof
Regular verb: fireproof - fireproofed- fireproofed

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

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

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

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