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