I could clean you could clean he could clean we could clean you could clean they could clean
Forma con V-ing
I could be cleaning you could be cleaning he could be cleaning we could be cleaning you could be cleaning they could be cleaning
Perfecto
I could have cleaned you could have cleaned he could have cleaned we could have cleaned you could have cleaned they could have cleaned
Perfecto con V-ing
I could have been cleaning you could have been cleaning he could have been cleaning we could have been cleaning you could have been cleaning they could have been cleaning
Negación
Forma simple
I could not clean you could not clean he could not clean we could not clean you could not clean they could not clean
Forma con V-ing
I could not be cleaning you could not be cleaning he could not be cleaning we could not be cleaning you could not be cleaning they could not be cleaning
Perfecto
I could not have cleaned you could not have cleaned he could not have cleaned we could not have cleaned you could not have cleaned they could not have cleaned
Perfecto con V-ing
I could not have been cleaning you could not have been cleaning he could not have been cleaning we could not have been cleaning you could not have been cleaning they could not have been cleaning
Forma interrogativa
Forma simple
could I clean? could you clean? could he clean? could we clean? could you clean? could they clean?
Forma con V-ing
could I be cleaning? could you be cleaning? could he be cleaning? could we be cleaning? could you be cleaning? could they be cleaning?
Perfecto
could I have cleaned? could you have cleaned? could he have cleaned? could we have cleaned? could you have cleaned? could they have cleaned?
Perfecto con V-ing
could I have been cleaning? could you have been cleaning? could he have been cleaning? could we have been cleaning? could you have been cleaning? could they have been cleaning?
Forma interro-negativa
Forma simple
could I not clean? could you not clean? could he not clean? could we not clean? could you not clean? could they not clean?
Forma con V-ing
could I not be cleaning? could you not be cleaning? could he not be cleaning? could we not be cleaning? could you not be cleaning? could they not be cleaning?
Perfecto
could I not have cleaned? could you not have cleaned? could he not have cleaned? could we not have cleaned? could you not have cleaned? could they not have cleaned?
Perfecto con V-ing
could I not have been cleaning? could you not have been cleaning? could he not have been cleaning? could we not have been cleaning? could you not have been cleaning? could they not have been cleaning?