I can button you can button he can button we can button you can button they can button
Forma com V-ing
I can be buttoning you can be buttoning he can be buttoning we can be buttoning you can be buttoning they can be buttoning
Perfeito
I can have buttoned you can have buttoned he can have buttoned we can have buttoned you can have buttoned they can have buttoned
Perfeito com V-ing
I can have been buttoning you can have been buttoning he can have been buttoning we can have been buttoning you can have been buttoning they can have been buttoning
Negação
Forma simple
I can't button you can't button he can't button we can't button you can't button they can't button
Forma com V-ing
I can't be buttoning you can't be buttoning he can't be buttoning we can't be buttoning you can't be buttoning they can't be buttoning
Perfeito
I can't have buttoned you can't have buttoned he can't have buttoned we can't have buttoned you can't have buttoned they can't have buttoned
Perfeito com V-ing
I can't have been buttoning you can't have been buttoning he can't have been buttoning we can't have been buttoning you can't have been buttoning they can't have been buttoning
Forma interrogativa
Forma simple
can I button? can you button? can he button? can we button? can you button? can they button?
Forma com V-ing
can I be buttoning? can you be buttoning? can he be buttoning? can we be buttoning? can you be buttoning? can they be buttoning?
Perfeito
can I have buttoned? can you have buttoned? can he have buttoned? can we have buttoned? can you have buttoned? can they have buttoned?
Perfeito com V-ing
can I have been buttoning? can you have been buttoning? can he have been buttoning? can we have been buttoning? can you have been buttoning? can they have been buttoning?
Forma interro-Negação
Forma simple
can't I button? can't you button? can't he button? can't we button? can't you button? can't they button?
Forma com V-ing
can't I be buttoning? can't you be buttoning? can't he be buttoning? can't we be buttoning? can't you be buttoning? can't they be buttoning?
Perfeito
can't I have buttoned? can't you have buttoned? can't he have buttoned? can't we have buttoned? can't you have buttoned? can't they have buttoned?
Perfeito com V-ing
can't I have been buttoning? can't you have been buttoning? can't he have been buttoning? can't we have been buttoning? can't you have been buttoning? can't they have been buttoning?