I could function you could function he could function we could function you could function they could function
Forma con V-ing
I could be functioning you could be functioning he could be functioning we could be functioning you could be functioning they could be functioning
Perfecto
I could have functioned you could have functioned he could have functioned we could have functioned you could have functioned they could have functioned
Perfecto con V-ing
I could have been functioning you could have been functioning he could have been functioning we could have been functioning you could have been functioning they could have been functioning
Negación
Forma simple
I could not function you could not function he could not function we could not function you could not function they could not function
Forma con V-ing
I could not be functioning you could not be functioning he could not be functioning we could not be functioning you could not be functioning they could not be functioning
Perfecto
I could not have functioned you could not have functioned he could not have functioned we could not have functioned you could not have functioned they could not have functioned
Perfecto con V-ing
I could not have been functioning you could not have been functioning he could not have been functioning we could not have been functioning you could not have been functioning they could not have been functioning
Forma interrogativa
Forma simple
could I function? could you function? could he function? could we function? could you function? could they function?
Forma con V-ing
could I be functioning? could you be functioning? could he be functioning? could we be functioning? could you be functioning? could they be functioning?
Perfecto
could I have functioned? could you have functioned? could he have functioned? could we have functioned? could you have functioned? could they have functioned?
Perfecto con V-ing
could I have been functioning? could you have been functioning? could he have been functioning? could we have been functioning? could you have been functioning? could they have been functioning?
Forma interro-negativa
Forma simple
could I not function? could you not function? could he not function? could we not function? could you not function? could they not function?
Forma con V-ing
could I not be functioning? could you not be functioning? could he not be functioning? could we not be functioning? could you not be functioning? could they not be functioning?
Perfecto
could I not have functioned? could you not have functioned? could he not have functioned? could we not have functioned? could you not have functioned? could they not have functioned?
Perfecto con V-ing
could I not have been functioning? could you not have been functioning? could he not have been functioning? could we not have been functioning? could you not have been functioning? could they not have been functioning?