could verify
Verbo regular: verify - verified- verified

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could verify
you could verify
he could verify
we could verify
you could verify
they could verify 	I could be verifying
you could be verifying
he could be verifying
we could be verifying
you could be verifying
they could be verifying	I could have verified
you could have verified
he 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
he could have been verifying
we could have been verifying
you could have been verifying
they could have been verifying	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I couldn't verify
you couldn't verify
he 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
he 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
he 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
he couldn't have been verifying
we couldn't have been verifying
you couldn't have been verifying
they couldn't have been verifying	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I verify?
could you verify?
could he verify?
could we verify?
could you verify?
could they verify? 	could I be verifying?
could you be verifying?
could he be verifying?
could we be verifying?
could you be verifying?
could they be verifying? 	could I have verified?
could you have verified?
could he 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 he have been verifying?
could we have been verifying?
could you have been verifying?
could they have been verifying? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
couldn't I verify?
couldn't you verify?
couldn't he 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 he 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 he 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 he have been verifying?
couldn't we have been verifying?
couldn't you have been verifying?
couldn't they have been verifying?