I can refute you can refute she can refute we can refute you can refute they can refute
Forma com V-ing
I can be refuting you can be refuting she can be refuting we can be refuting you can be refuting they can be refuting
Perfeito
I can have refuted you can have refuted she can have refuted we can have refuted you can have refuted they can have refuted
Perfeito com V-ing
I can have been refuting you can have been refuting she can have been refuting we can have been refuting you can have been refuting they can have been refuting
Negação
Forma simple
I can't refute you can't refute she can't refute we can't refute you can't refute they can't refute
Forma com V-ing
I can't be refuting you can't be refuting she can't be refuting we can't be refuting you can't be refuting they can't be refuting
Perfeito
I can't have refuted you can't have refuted she can't have refuted we can't have refuted you can't have refuted they can't have refuted
Perfeito com V-ing
I can't have been refuting you can't have been refuting she can't have been refuting we can't have been refuting you can't have been refuting they can't have been refuting
Forma interrogativa
Forma simple
can I refute? can you refute? can she refute? can we refute? can you refute? can they refute?
Forma com V-ing
can I be refuting? can you be refuting? can she be refuting? can we be refuting? can you be refuting? can they be refuting?
Perfeito
can I have refuted? can you have refuted? can she have refuted? can we have refuted? can you have refuted? can they have refuted?
Perfeito com V-ing
can I have been refuting? can you have been refuting? can she have been refuting? can we have been refuting? can you have been refuting? can they have been refuting?
Forma interro-Negação
Forma simple
can't I refute? can't you refute? can't she refute? can't we refute? can't you refute? can't they refute?
Forma com V-ing
can't I be refuting? can't you be refuting? can't she be refuting? can't we be refuting? can't you be refuting? can't they be refuting?
Perfeito
can't I have refuted? can't you have refuted? can't she have refuted? can't we have refuted? can't you have refuted? can't they have refuted?
Perfeito com V-ing
can't I have been refuting? can't you have been refuting? can't she have been refuting? can't we have been refuting? can't you have been refuting? can't they have been refuting?