I could specify you could specify she could specify we could specify you could specify they could specify
Forma con V-ing
I could be specifying you could be specifying she could be specifying we could be specifying you could be specifying they could be specifying
Perfecto
I could have specified you could have specified she could have specified we could have specified you could have specified they could have specified
Perfecto con V-ing
I could have been specifying you could have been specifying she could have been specifying we could have been specifying you could have been specifying they could have been specifying
Negación
Forma simple
I couldn't specify you couldn't specify she couldn't specify we couldn't specify you couldn't specify they couldn't specify
Forma con V-ing
I couldn't be specifying you couldn't be specifying she couldn't be specifying we couldn't be specifying you couldn't be specifying they couldn't be specifying
Perfecto
I couldn't have specified you couldn't have specified she couldn't have specified we couldn't have specified you couldn't have specified they couldn't have specified
Perfecto con V-ing
I couldn't have been specifying you couldn't have been specifying she couldn't have been specifying we couldn't have been specifying you couldn't have been specifying they couldn't have been specifying
Forma interrogativa
Forma simple
could I specify? could you specify? could she specify? could we specify? could you specify? could they specify?
Forma con V-ing
could I be specifying? could you be specifying? could she be specifying? could we be specifying? could you be specifying? could they be specifying?
Perfecto
could I have specified? could you have specified? could she have specified? could we have specified? could you have specified? could they have specified?
Perfecto con V-ing
could I have been specifying? could you have been specifying? could she have been specifying? could we have been specifying? could you have been specifying? could they have been specifying?
Forma interro-negativa
Forma simple
couldn't I specify? couldn't you specify? couldn't she specify? couldn't we specify? couldn't you specify? couldn't they specify?
Forma con V-ing
couldn't I be specifying? couldn't you be specifying? couldn't she be specifying? couldn't we be specifying? couldn't you be specifying? couldn't they be specifying?
Perfecto
couldn't I have specified? couldn't you have specified? couldn't she have specified? couldn't we have specified? couldn't you have specified? couldn't they have specified?
Perfecto con V-ing
couldn't I have been specifying? couldn't you have been specifying? couldn't she have been specifying? couldn't we have been specifying? couldn't you have been specifying? couldn't they have been specifying?