I can prevent you can prevent he can prevent we can prevent you can prevent they can prevent
Forma com V-ing
I can be preventing you can be preventing he can be preventing we can be preventing you can be preventing they can be preventing
Perfeito
I can have prevented you can have prevented he can have prevented we can have prevented you can have prevented they can have prevented
Perfeito com V-ing
I can have been preventing you can have been preventing he can have been preventing we can have been preventing you can have been preventing they can have been preventing
Negação
Forma simple
I can't prevent you can't prevent he can't prevent we can't prevent you can't prevent they can't prevent
Forma com V-ing
I can't be preventing you can't be preventing he can't be preventing we can't be preventing you can't be preventing they can't be preventing
Perfeito
I can't have prevented you can't have prevented he can't have prevented we can't have prevented you can't have prevented they can't have prevented
Perfeito com V-ing
I can't have been preventing you can't have been preventing he can't have been preventing we can't have been preventing you can't have been preventing they can't have been preventing
Forma interrogativa
Forma simple
can I prevent? can you prevent? can he prevent? can we prevent? can you prevent? can they prevent?
Forma com V-ing
can I be preventing? can you be preventing? can he be preventing? can we be preventing? can you be preventing? can they be preventing?
Perfeito
can I have prevented? can you have prevented? can he have prevented? can we have prevented? can you have prevented? can they have prevented?
Perfeito com V-ing
can I have been preventing? can you have been preventing? can he have been preventing? can we have been preventing? can you have been preventing? can they have been preventing?
Forma interro-Negação
Forma simple
can't I prevent? can't you prevent? can't he prevent? can't we prevent? can't you prevent? can't they prevent?
Forma com V-ing
can't I be preventing? can't you be preventing? can't he be preventing? can't we be preventing? can't you be preventing? can't they be preventing?
Perfeito
can't I have prevented? can't you have prevented? can't he have prevented? can't we have prevented? can't you have prevented? can't they have prevented?
Perfeito com V-ing
can't I have been preventing? can't you have been preventing? can't he have been preventing? can't we have been preventing? can't you have been preventing? can't they have been preventing?