can proof
Verbo regular: proof - proofed- proofed

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

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

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

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