I could calendar you could calendar he could calendar we could calendar you could calendar they could calendar
Forma con V-ing
I could be calendaring you could be calendaring he could be calendaring we could be calendaring you could be calendaring they could be calendaring
Perfecto
I could have calendared you could have calendared he could have calendared we could have calendared you could have calendared they could have calendared
Perfecto con V-ing
I could have been calendaring you could have been calendaring he could have been calendaring we could have been calendaring you could have been calendaring they could have been calendaring
Negación
Forma simple
I could not calendar you could not calendar he could not calendar we could not calendar you could not calendar they could not calendar
Forma con V-ing
I could not be calendaring you could not be calendaring he could not be calendaring we could not be calendaring you could not be calendaring they could not be calendaring
Perfecto
I could not have calendared you could not have calendared he could not have calendared we could not have calendared you could not have calendared they could not have calendared
Perfecto con V-ing
I could not have been calendaring you could not have been calendaring he could not have been calendaring we could not have been calendaring you could not have been calendaring they could not have been calendaring
Forma interrogativa
Forma simple
could I calendar? could you calendar? could he calendar? could we calendar? could you calendar? could they calendar?
Forma con V-ing
could I be calendaring? could you be calendaring? could he be calendaring? could we be calendaring? could you be calendaring? could they be calendaring?
Perfecto
could I have calendared? could you have calendared? could he have calendared? could we have calendared? could you have calendared? could they have calendared?
Perfecto con V-ing
could I have been calendaring? could you have been calendaring? could he have been calendaring? could we have been calendaring? could you have been calendaring? could they have been calendaring?
Forma interro-negativa
Forma simple
could I not calendar? could you not calendar? could he not calendar? could we not calendar? could you not calendar? could they not calendar?
Forma con V-ing
could I not be calendaring? could you not be calendaring? could he not be calendaring? could we not be calendaring? could you not be calendaring? could they not be calendaring?
Perfecto
could I not have calendared? could you not have calendared? could he not have calendared? could we not have calendared? could you not have calendared? could they not have calendared?
Perfecto con V-ing
could I not have been calendaring? could you not have been calendaring? could he not have been calendaring? could we not have been calendaring? could you not have been calendaring? could they not have been calendaring?