I could scratch you could scratch she could scratch we could scratch you could scratch they could scratch
Forma con V-ing
I could be scratching you could be scratching she could be scratching we could be scratching you could be scratching they could be scratching
Perfecto
I could have scratched you could have scratched she could have scratched we could have scratched you could have scratched they could have scratched
Perfecto con V-ing
I could have been scratching you could have been scratching she could have been scratching we could have been scratching you could have been scratching they could have been scratching
Negación
Forma simple
I could not scratch you could not scratch she could not scratch we could not scratch you could not scratch they could not scratch
Forma con V-ing
I could not be scratching you could not be scratching she could not be scratching we could not be scratching you could not be scratching they could not be scratching
Perfecto
I could not have scratched you could not have scratched she could not have scratched we could not have scratched you could not have scratched they could not have scratched
Perfecto con V-ing
I could not have been scratching you could not have been scratching she could not have been scratching we could not have been scratching you could not have been scratching they could not have been scratching
Forma interrogativa
Forma simple
could I scratch? could you scratch? could she scratch? could we scratch? could you scratch? could they scratch?
Forma con V-ing
could I be scratching? could you be scratching? could she be scratching? could we be scratching? could you be scratching? could they be scratching?
Perfecto
could I have scratched? could you have scratched? could she have scratched? could we have scratched? could you have scratched? could they have scratched?
Perfecto con V-ing
could I have been scratching? could you have been scratching? could she have been scratching? could we have been scratching? could you have been scratching? could they have been scratching?
Forma interro-negativa
Forma simple
could I not scratch? could you not scratch? could she not scratch? could we not scratch? could you not scratch? could they not scratch?
Forma con V-ing
could I not be scratching? could you not be scratching? could she not be scratching? could we not be scratching? could you not be scratching? could they not be scratching?
Perfecto
could I not have scratched? could you not have scratched? could she not have scratched? could we not have scratched? could you not have scratched? could they not have scratched?
Perfecto con V-ing
could I not have been scratching? could you not have been scratching? could she not have been scratching? could we not have been scratching? could you not have been scratching? could they not have been scratching?