I can author you can author he can author we can author you can author they can author
Forma com V-ing
I can be authoring you can be authoring he can be authoring we can be authoring you can be authoring they can be authoring
Perfeito
I can have authored you can have authored he can have authored we can have authored you can have authored they can have authored
Perfeito com V-ing
I can have been authoring you can have been authoring he can have been authoring we can have been authoring you can have been authoring they can have been authoring
Negação
Forma simple
I can't author you can't author he can't author we can't author you can't author they can't author
Forma com V-ing
I can't be authoring you can't be authoring he can't be authoring we can't be authoring you can't be authoring they can't be authoring
Perfeito
I can't have authored you can't have authored he can't have authored we can't have authored you can't have authored they can't have authored
Perfeito com V-ing
I can't have been authoring you can't have been authoring he can't have been authoring we can't have been authoring you can't have been authoring they can't have been authoring
Forma interrogativa
Forma simple
can I author? can you author? can he author? can we author? can you author? can they author?
Forma com V-ing
can I be authoring? can you be authoring? can he be authoring? can we be authoring? can you be authoring? can they be authoring?
Perfeito
can I have authored? can you have authored? can he have authored? can we have authored? can you have authored? can they have authored?
Perfeito com V-ing
can I have been authoring? can you have been authoring? can he have been authoring? can we have been authoring? can you have been authoring? can they have been authoring?
Forma interro-Negação
Forma simple
can't I author? can't you author? can't he author? can't we author? can't you author? can't they author?
Forma com V-ing
can't I be authoring? can't you be authoring? can't he be authoring? can't we be authoring? can't you be authoring? can't they be authoring?
Perfeito
can't I have authored? can't you have authored? can't he have authored? can't we have authored? can't you have authored? can't they have authored?
Perfeito com V-ing
can't I have been authoring? can't you have been authoring? can't he have been authoring? can't we have been authoring? can't you have been authoring? can't they have been authoring?