I can box you can box she can box we can box you can box they can box
Forma com V-ing
I can be boxing you can be boxing she can be boxing we can be boxing you can be boxing they can be boxing
Perfeito
I can have boxed you can have boxed she can have boxed we can have boxed you can have boxed they can have boxed
Perfeito com V-ing
I can have been boxing you can have been boxing she can have been boxing we can have been boxing you can have been boxing they can have been boxing
Negação
Forma simple
I can't box you can't box she can't box we can't box you can't box they can't box
Forma com V-ing
I can't be boxing you can't be boxing she can't be boxing we can't be boxing you can't be boxing they can't be boxing
Perfeito
I can't have boxed you can't have boxed she can't have boxed we can't have boxed you can't have boxed they can't have boxed
Perfeito com V-ing
I can't have been boxing you can't have been boxing she can't have been boxing we can't have been boxing you can't have been boxing they can't have been boxing
Forma interrogativa
Forma simple
can I box? can you box? can she box? can we box? can you box? can they box?
Forma com V-ing
can I be boxing? can you be boxing? can she be boxing? can we be boxing? can you be boxing? can they be boxing?
Perfeito
can I have boxed? can you have boxed? can she have boxed? can we have boxed? can you have boxed? can they have boxed?
Perfeito com V-ing
can I have been boxing? can you have been boxing? can she have been boxing? can we have been boxing? can you have been boxing? can they have been boxing?
Forma interro-Negação
Forma simple
can't I box? can't you box? can't she box? can't we box? can't you box? can't they box?
Forma com V-ing
can't I be boxing? can't you be boxing? can't she be boxing? can't we be boxing? can't you be boxing? can't they be boxing?
Perfeito
can't I have boxed? can't you have boxed? can't she have boxed? can't we have boxed? can't you have boxed? can't they have boxed?
Perfeito com V-ing
can't I have been boxing? can't you have been boxing? can't she have been boxing? can't we have been boxing? can't you have been boxing? can't they have been boxing?