I could dust you could dust he could dust we could dust you could dust they could dust
Forma con V-ing
I could be dusting you could be dusting he could be dusting we could be dusting you could be dusting they could be dusting
Perfecto
I could have dusted you could have dusted he could have dusted we could have dusted you could have dusted they could have dusted
Perfecto con V-ing
I could have been dusting you could have been dusting he could have been dusting we could have been dusting you could have been dusting they could have been dusting
Negación
Forma simple
I could not dust you could not dust he could not dust we could not dust you could not dust they could not dust
Forma con V-ing
I could not be dusting you could not be dusting he could not be dusting we could not be dusting you could not be dusting they could not be dusting
Perfecto
I could not have dusted you could not have dusted he could not have dusted we could not have dusted you could not have dusted they could not have dusted
Perfecto con V-ing
I could not have been dusting you could not have been dusting he could not have been dusting we could not have been dusting you could not have been dusting they could not have been dusting
Forma interrogativa
Forma simple
could I dust? could you dust? could he dust? could we dust? could you dust? could they dust?
Forma con V-ing
could I be dusting? could you be dusting? could he be dusting? could we be dusting? could you be dusting? could they be dusting?
Perfecto
could I have dusted? could you have dusted? could he have dusted? could we have dusted? could you have dusted? could they have dusted?
Perfecto con V-ing
could I have been dusting? could you have been dusting? could he have been dusting? could we have been dusting? could you have been dusting? could they have been dusting?
Forma interro-negativa
Forma simple
could I not dust? could you not dust? could he not dust? could we not dust? could you not dust? could they not dust?
Forma con V-ing
could I not be dusting? could you not be dusting? could he not be dusting? could we not be dusting? could you not be dusting? could they not be dusting?
Perfecto
could I not have dusted? could you not have dusted? could he not have dusted? could we not have dusted? could you not have dusted? could they not have dusted?
Perfecto con V-ing
could I not have been dusting? could you not have been dusting? could he not have been dusting? could we not have been dusting? could you not have been dusting? could they not have been dusting?