I can grind you can grind he can grind we can grind you can grind they can grind
Forma con V-ing
I can be grinding you can be grinding he can be grinding we can be grinding you can be grinding they can be grinding
Perfecto
I can have ground you can have ground he can have ground we can have ground you can have ground they can have ground
Perfecto con V-ing
I can have been grinding you can have been grinding he can have been grinding we can have been grinding you can have been grinding they can have been grinding
Negación
Forma simple
I cannot grind you cannot grind he cannot grind we cannot grind you cannot grind they cannot grind
Forma con V-ing
I cannot be grinding you cannot be grinding he cannot be grinding we cannot be grinding you cannot be grinding they cannot be grinding
Perfecto
I cannot have ground you cannot have ground he cannot have ground we cannot have ground you cannot have ground they cannot have ground
Perfecto con V-ing
I cannot have been grinding you cannot have been grinding he cannot have been grinding we cannot have been grinding you cannot have been grinding they cannot have been grinding
Forma interrogativa
Forma simple
can I grind? can you grind? can he grind? can we grind? can you grind? can they grind?
Forma con V-ing
can I be grinding? can you be grinding? can he be grinding? can we be grinding? can you be grinding? can they be grinding?
Perfecto
can I have ground? can you have ground? can he have ground? can we have ground? can you have ground? can they have ground?
Perfecto con V-ing
can I have been grinding? can you have been grinding? can he have been grinding? can we have been grinding? can you have been grinding? can they have been grinding?
Forma interro-negativa
Forma simple
can I not grind? can you not grind? can he not grind? can we not grind? can you not grind? can they not grind?
Forma con V-ing
can I not be grinding? can you not be grinding? can he not be grinding? can we not be grinding? can you not be grinding? can they not be grinding?
Perfecto
can I not have ground? can you not have ground? can he not have ground? can we not have ground? can you not have ground? can they not have ground?
Perfecto con V-ing
can I not have been grinding? can you not have been grinding? can he not have been grinding? can we not have been grinding? can you not have been grinding? can they not have been grinding?