I can sit you can sit she can sit we can sit you can sit they can sit
Forma con V-ing
I can be sitting you can be sitting she can be sitting we can be sitting you can be sitting they can be sitting
Perfecto
I can have sat you can have sat she can have sat we can have sat you can have sat they can have sat
Perfecto con V-ing
I can have been sitting you can have been sitting she can have been sitting we can have been sitting you can have been sitting they can have been sitting
Negación
Forma simple
I cannot sit you cannot sit she cannot sit we cannot sit you cannot sit they cannot sit
Forma con V-ing
I cannot be sitting you cannot be sitting she cannot be sitting we cannot be sitting you cannot be sitting they cannot be sitting
Perfecto
I cannot have sat you cannot have sat she cannot have sat we cannot have sat you cannot have sat they cannot have sat
Perfecto con V-ing
I cannot have been sitting you cannot have been sitting she cannot have been sitting we cannot have been sitting you cannot have been sitting they cannot have been sitting
Forma interrogativa
Forma simple
can I sit? can you sit? can she sit? can we sit? can you sit? can they sit?
Forma con V-ing
can I be sitting? can you be sitting? can she be sitting? can we be sitting? can you be sitting? can they be sitting?
Perfecto
can I have sat? can you have sat? can she have sat? can we have sat? can you have sat? can they have sat?
Perfecto con V-ing
can I have been sitting? can you have been sitting? can she have been sitting? can we have been sitting? can you have been sitting? can they have been sitting?
Forma interro-negativa
Forma simple
can I not sit? can you not sit? can she not sit? can we not sit? can you not sit? can they not sit?
Forma con V-ing
can I not be sitting? can you not be sitting? can she not be sitting? can we not be sitting? can you not be sitting? can they not be sitting?
Perfecto
can I not have sat? can you not have sat? can she not have sat? can we not have sat? can you not have sat? can they not have sat?
Perfecto con V-ing
can I not have been sitting? can you not have been sitting? can she not have been sitting? can we not have been sitting? can you not have been sitting? can they not have been sitting?