I could specify you could specify he could specify we could specify you could specify they could specify
Forma con V-ing
I could be specifying you could be specifying he could be specifying we could be specifying you could be specifying they could be specifying
Perfecto
I could have specified you could have specified he 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 he 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 he 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 he 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 he 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 he 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 he specify? could we specify? could you specify? could they specify?
Forma con V-ing
could I be specifying? could you be specifying? could he be specifying? could we be specifying? could you be specifying? could they be specifying?
Perfecto
could I have specified? could you have specified? could he 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 he 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 he 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 he 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 he 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 he have been specifying? couldn't we have been specifying? couldn't you have been specifying? couldn't they have been specifying?