English verb conjugation
CAN PROOF

Regular verb: proof - proofed - proofed

Affirmation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Negation

Simple form	V-ing form
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
Perfect	V-ing perfect
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

Interrogative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?

Interro-negative form

Simple form	V-ing form
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?
Perfect	V-ing perfect
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?