I can verify you can verify she can verify we can verify you can verify they can verify
V-ing form
I can be verifying you can be verifying she can be verifying we can be verifying you can be verifying they can be verifying
Perfect
I can have verified you can have verified she 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 she 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 she cannot verify we cannot verify you cannot verify they cannot verify
V-ing form
I cannot be verifying you cannot be verifying she cannot be verifying we cannot be verifying you cannot be verifying they cannot be verifying
Perfect
I cannot have verified you cannot have verified she 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 she 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 she verify? can we verify? can you verify? can they verify?
V-ing form
can I be verifying? can you be verifying? can she be verifying? can we be verifying? can you be verifying? can they be verifying?
Perfect
can I have verified? can you have verified? can she 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 she 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 she 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 she 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 she 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 she not have been verifying? can we not have been verifying? can you not have been verifying? can they not have been verifying?