could verify
Regular verb: verify - verified- verified

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could verify
you could verify
she could verify
we could verify
you could verify
they could verify 	I could be verifying
you could be verifying
she could be verifying
we could be verifying
you could be verifying
they could be verifying	I could have verified
you could have verified
she could have verified
we could have verified
you could have verified
they could have verified	I could have been verifying
you could have been verifying
she could have been verifying
we could have been verifying
you could have been verifying
they could have been verifying	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't verify
you couldn't verify
she couldn't verify
we couldn't verify
you couldn't verify
they couldn't verify 	I couldn't be verifying
you couldn't be verifying
she couldn't be verifying
we couldn't be verifying
you couldn't be verifying
they couldn't be verifying	I couldn't have verified
you couldn't have verified
she couldn't have verified
we couldn't have verified
you couldn't have verified
they couldn't have verified	I couldn't have been verifying
you couldn't have been verifying
she couldn't have been verifying
we couldn't have been verifying
you couldn't have been verifying
they couldn't have been verifying	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I verify?
could you verify?
could she verify?
could we verify?
could you verify?
could they verify? 	could I be verifying?
could you be verifying?
could she be verifying?
could we be verifying?
could you be verifying?
could they be verifying? 	could I have verified?
could you have verified?
could she have verified?
could we have verified?
could you have verified?
could they have verified? 	could I have been verifying?
could you have been verifying?
could she have been verifying?
could we have been verifying?
could you have been verifying?
could they have been verifying? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I verify?
couldn't you verify?
couldn't she verify?
couldn't we verify?
couldn't you verify?
couldn't they verify? 	couldn't I be verifying?
couldn't you be verifying?
couldn't she be verifying?
couldn't we be verifying?
couldn't you be verifying?
couldn't they be verifying? 	couldn't I have verified?
couldn't you have verified?
couldn't she have verified?
couldn't we have verified?
couldn't you have verified?
couldn't they have verified? 	couldn't I have been verifying?
couldn't you have been verifying?
couldn't she have been verifying?
couldn't we have been verifying?
couldn't you have been verifying?
couldn't they have been verifying?