could rustproof
Regular verb: rustproof - rustproofed- rustproofed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could rustproof
you could rustproof
she could rustproof
we could rustproof
you could rustproof
they could rustproof 	I could be rustproofing
you could be rustproofing
she could be rustproofing
we could be rustproofing
you could be rustproofing
they could be rustproofing	I could have rustproofed
you could have rustproofed
she could have rustproofed
we could have rustproofed
you could have rustproofed
they could have rustproofed	I could have been rustproofing
you could have been rustproofing
she could have been rustproofing
we could have been rustproofing
you could have been rustproofing
they could have been rustproofing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not rustproof
you could not rustproof
she could not rustproof
we could not rustproof
you could not rustproof
they could not rustproof 	I could not be rustproofing
you could not be rustproofing
she could not be rustproofing
we could not be rustproofing
you could not be rustproofing
they could not be rustproofing	I could not have rustproofed
you could not have rustproofed
she could not have rustproofed
we could not have rustproofed
you could not have rustproofed
they could not have rustproofed	I could not have been rustproofing
you could not have been rustproofing
she could not have been rustproofing
we could not have been rustproofing
you could not have been rustproofing
they could not have been rustproofing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I rustproof?
could you rustproof?
could she rustproof?
could we rustproof?
could you rustproof?
could they rustproof? 	could I be rustproofing?
could you be rustproofing?
could she be rustproofing?
could we be rustproofing?
could you be rustproofing?
could they be rustproofing? 	could I have rustproofed?
could you have rustproofed?
could she have rustproofed?
could we have rustproofed?
could you have rustproofed?
could they have rustproofed? 	could I have been rustproofing?
could you have been rustproofing?
could she have been rustproofing?
could we have been rustproofing?
could you have been rustproofing?
could they have been rustproofing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not rustproof?
could you not rustproof?
could she not rustproof?
could we not rustproof?
could you not rustproof?
could they not rustproof? 	could I not be rustproofing?
could you not be rustproofing?
could she not be rustproofing?
could we not be rustproofing?
could you not be rustproofing?
could they not be rustproofing? 	could I not have rustproofed?
could you not have rustproofed?
could she not have rustproofed?
could we not have rustproofed?
could you not have rustproofed?
could they not have rustproofed? 	could I not have been rustproofing?
could you not have been rustproofing?
could she not have been rustproofing?
could we not have been rustproofing?
could you not have been rustproofing?
could they not have been rustproofing?