English verb conjugation
CAN PROOF

Regular verb: proof - proofed - proofed

Affirmation

Simple form	V-ing form
I can proof you can proof he can proof we can proof you can proof they can proof	I can be proofing you can be proofing he 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 he 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 he 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 can't proof you can't proof he can't proof we can't proof you can't proof they can't proof	I can't be proofing you can't be proofing he can't be proofing we can't be proofing you can't be proofing they can't be proofing
Perfect	V-ing perfect
I can't have proofed you can't have proofed he can't have proofed we can't have proofed you can't have proofed they can't have proofed	I can't have been proofing you can't have been proofing he can't have been proofing we can't have been proofing you can't have been proofing they can't have been proofing

Interrogative form

Simple form	V-ing form
can I proof? can you proof? can he proof? can we proof? can you proof? can they proof?	can I be proofing? can you be proofing? can he 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 he 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 he 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't I proof? can't you proof? can't he proof? can't we proof? can't you proof? can't they proof?	can't I be proofing? can't you be proofing? can't he be proofing? can't we be proofing? can't you be proofing? can't they be proofing?
Perfect	V-ing perfect
can't I have proofed? can't you have proofed? can't he have proofed? can't we have proofed? can't you have proofed? can't they have proofed?	can't I have been proofing? can't you have been proofing? can't he have been proofing? can't we have been proofing? can't you have been proofing? can't they have been proofing?