I can verify you can verify he can verify we can verify you can verify they can verify
V-ing form
I can be verifying you can be verifying he can be verifying we can be verifying you can be verifying they can be verifying
Perfect
I can have verified you can have verified he can have verified we can have verified you can have verified they can have verified
V-ing perfect
I can have been verifying you can have been verifying he can have been verifying we can have been verifying you can have been verifying they can have been verifying
Negation
Simple form
I cannot verify you cannot verify he cannot verify we cannot verify you cannot verify they cannot verify
V-ing form
I cannot be verifying you cannot be verifying he cannot be verifying we cannot be verifying you cannot be verifying they cannot be verifying
Perfect
I cannot have verified you cannot have verified he cannot have verified we cannot have verified you cannot have verified they cannot have verified
V-ing perfect
I cannot have been verifying you cannot have been verifying he cannot have been verifying we cannot have been verifying you cannot have been verifying they cannot have been verifying
Interrogative form
Simple form
can I verify? can you verify? can he verify? can we verify? can you verify? can they verify?
V-ing form
can I be verifying? can you be verifying? can he be verifying? can we be verifying? can you be verifying? can they be verifying?
Perfect
can I have verified? can you have verified? can he have verified? can we have verified? can you have verified? can they have verified?
V-ing perfect
can I have been verifying? can you have been verifying? can he have been verifying? can we have been verifying? can you have been verifying? can they have been verifying?
Interro-negative form
Simple form
can I not verify? can you not verify? can he not verify? can we not verify? can you not verify? can they not verify?
V-ing form
can I not be verifying? can you not be verifying? can he not be verifying? can we not be verifying? can you not be verifying? can they not be verifying?
Perfect
can I not have verified? can you not have verified? can he not have verified? can we not have verified? can you not have verified? can they not have verified?
V-ing perfect
can I not have been verifying? can you not have been verifying? can he not have been verifying? can we not have been verifying? can you not have been verifying? can they not have been verifying?