I can trade you can trade he can trade we can trade you can trade they can trade
Forma com V-ing
I can be trading you can be trading he can be trading we can be trading you can be trading they can be trading
Perfeito
I can have traded you can have traded he can have traded we can have traded you can have traded they can have traded
Perfeito com V-ing
I can have been trading you can have been trading he can have been trading we can have been trading you can have been trading they can have been trading
Negação
Forma simple
I cannot trade you cannot trade he cannot trade we cannot trade you cannot trade they cannot trade
Forma com V-ing
I cannot be trading you cannot be trading he cannot be trading we cannot be trading you cannot be trading they cannot be trading
Perfeito
I cannot have traded you cannot have traded he cannot have traded we cannot have traded you cannot have traded they cannot have traded
Perfeito com V-ing
I cannot have been trading you cannot have been trading he cannot have been trading we cannot have been trading you cannot have been trading they cannot have been trading
Forma interrogativa
Forma simple
can I trade? can you trade? can he trade? can we trade? can you trade? can they trade?
Forma com V-ing
can I be trading? can you be trading? can he be trading? can we be trading? can you be trading? can they be trading?
Perfeito
can I have traded? can you have traded? can he have traded? can we have traded? can you have traded? can they have traded?
Perfeito com V-ing
can I have been trading? can you have been trading? can he have been trading? can we have been trading? can you have been trading? can they have been trading?
Forma interro-Negação
Forma simple
can I not trade? can you not trade? can he not trade? can we not trade? can you not trade? can they not trade?
Forma com V-ing
can I not be trading? can you not be trading? can he not be trading? can we not be trading? can you not be trading? can they not be trading?
Perfeito
can I not have traded? can you not have traded? can he not have traded? can we not have traded? can you not have traded? can they not have traded?
Perfeito com V-ing
can I not have been trading? can you not have been trading? can he not have been trading? can we not have been trading? can you not have been trading? can they not have been trading?