I could verify you could verify she could verify we could verify you could verify they could verify
Forma con V-ing
I could be verifying you could be verifying she could be verifying we could be verifying you could be verifying they could be verifying
Perfecto
I could have verified you could have verified she could have verified we could have verified you could have verified they could have verified
Perfecto con V-ing
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
Negación
Forma simple
I couldn't verify you couldn't verify she couldn't verify we couldn't verify you couldn't verify they couldn't verify
Forma con V-ing
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
Perfecto
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
Perfecto con V-ing
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
Forma interrogativa
Forma simple
could I verify? could you verify? could she verify? could we verify? could you verify? could they verify?
Forma con V-ing
could I be verifying? could you be verifying? could she be verifying? could we be verifying? could you be verifying? could they be verifying?
Perfecto
could I have verified? could you have verified? could she have verified? could we have verified? could you have verified? could they have verified?
Perfecto con V-ing
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?
Forma interro-negativa
Forma simple
couldn't I verify? couldn't you verify? couldn't she verify? couldn't we verify? couldn't you verify? couldn't they verify?
Forma con V-ing
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?
Perfecto
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?
Perfecto con V-ing
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?