I could test you could test she could test we could test you could test they could test
Forma con V-ing
I could be testing you could be testing she could be testing we could be testing you could be testing they could be testing
Perfecto
I could have tested you could have tested she could have tested we could have tested you could have tested they could have tested
Perfecto con V-ing
I could have been testing you could have been testing she could have been testing we could have been testing you could have been testing they could have been testing
Negación
Forma simple
I could not test you could not test she could not test we could not test you could not test they could not test
Forma con V-ing
I could not be testing you could not be testing she could not be testing we could not be testing you could not be testing they could not be testing
Perfecto
I could not have tested you could not have tested she could not have tested we could not have tested you could not have tested they could not have tested
Perfecto con V-ing
I could not have been testing you could not have been testing she could not have been testing we could not have been testing you could not have been testing they could not have been testing
Forma interrogativa
Forma simple
could I test? could you test? could she test? could we test? could you test? could they test?
Forma con V-ing
could I be testing? could you be testing? could she be testing? could we be testing? could you be testing? could they be testing?
Perfecto
could I have tested? could you have tested? could she have tested? could we have tested? could you have tested? could they have tested?
Perfecto con V-ing
could I have been testing? could you have been testing? could she have been testing? could we have been testing? could you have been testing? could they have been testing?
Forma interro-negativa
Forma simple
could I not test? could you not test? could she not test? could we not test? could you not test? could they not test?
Forma con V-ing
could I not be testing? could you not be testing? could she not be testing? could we not be testing? could you not be testing? could they not be testing?
Perfecto
could I not have tested? could you not have tested? could she not have tested? could we not have tested? could you not have tested? could they not have tested?
Perfecto con V-ing
could I not have been testing? could you not have been testing? could she not have been testing? could we not have been testing? could you not have been testing? could they not have been testing?