I can sit you can sit he can sit we can sit you can sit they can sit
Forma com V-ing
I can be sitting you can be sitting he can be sitting we can be sitting you can be sitting they can be sitting
Perfeito
I can have sat you can have sat he can have sat we can have sat you can have sat they can have sat
Perfeito com V-ing
I can have been sitting you can have been sitting he can have been sitting we can have been sitting you can have been sitting they can have been sitting
Negação
Forma simple
I can't sit you can't sit he can't sit we can't sit you can't sit they can't sit
Forma com V-ing
I can't be sitting you can't be sitting he can't be sitting we can't be sitting you can't be sitting they can't be sitting
Perfeito
I can't have sat you can't have sat he can't have sat we can't have sat you can't have sat they can't have sat
Perfeito com V-ing
I can't have been sitting you can't have been sitting he can't have been sitting we can't have been sitting you can't have been sitting they can't have been sitting
Forma interrogativa
Forma simple
can I sit? can you sit? can he sit? can we sit? can you sit? can they sit?
Forma com V-ing
can I be sitting? can you be sitting? can he be sitting? can we be sitting? can you be sitting? can they be sitting?
Perfeito
can I have sat? can you have sat? can he have sat? can we have sat? can you have sat? can they have sat?
Perfeito com V-ing
can I have been sitting? can you have been sitting? can he have been sitting? can we have been sitting? can you have been sitting? can they have been sitting?
Forma interro-Negação
Forma simple
can't I sit? can't you sit? can't he sit? can't we sit? can't you sit? can't they sit?
Forma com V-ing
can't I be sitting? can't you be sitting? can't he be sitting? can't we be sitting? can't you be sitting? can't they be sitting?
Perfeito
can't I have sat? can't you have sat? can't he have sat? can't we have sat? can't you have sat? can't they have sat?
Perfeito com V-ing
can't I have been sitting? can't you have been sitting? can't he have been sitting? can't we have been sitting? can't you have been sitting? can't they have been sitting?