I could commence you could commence he could commence we could commence you could commence they could commence
Forma con V-ing
I could be commencing you could be commencing he could be commencing we could be commencing you could be commencing they could be commencing
Perfecto
I could have commenced you could have commenced he could have commenced we could have commenced you could have commenced they could have commenced
Perfecto con V-ing
I could have been commencing you could have been commencing he could have been commencing we could have been commencing you could have been commencing they could have been commencing
Negación
Forma simple
I could not commence you could not commence he could not commence we could not commence you could not commence they could not commence
Forma con V-ing
I could not be commencing you could not be commencing he could not be commencing we could not be commencing you could not be commencing they could not be commencing
Perfecto
I could not have commenced you could not have commenced he could not have commenced we could not have commenced you could not have commenced they could not have commenced
Perfecto con V-ing
I could not have been commencing you could not have been commencing he could not have been commencing we could not have been commencing you could not have been commencing they could not have been commencing
Forma interrogativa
Forma simple
could I commence? could you commence? could he commence? could we commence? could you commence? could they commence?
Forma con V-ing
could I be commencing? could you be commencing? could he be commencing? could we be commencing? could you be commencing? could they be commencing?
Perfecto
could I have commenced? could you have commenced? could he have commenced? could we have commenced? could you have commenced? could they have commenced?
Perfecto con V-ing
could I have been commencing? could you have been commencing? could he have been commencing? could we have been commencing? could you have been commencing? could they have been commencing?
Forma interro-negativa
Forma simple
could I not commence? could you not commence? could he not commence? could we not commence? could you not commence? could they not commence?
Forma con V-ing
could I not be commencing? could you not be commencing? could he not be commencing? could we not be commencing? could you not be commencing? could they not be commencing?
Perfecto
could I not have commenced? could you not have commenced? could he not have commenced? could we not have commenced? could you not have commenced? could they not have commenced?
Perfecto con V-ing
could I not have been commencing? could you not have been commencing? could he not have been commencing? could we not have been commencing? could you not have been commencing? could they not have been commencing?