I can trade you can trade she can trade we can trade you can trade they can trade
Forma con V-ing
I can be trading you can be trading she can be trading we can be trading you can be trading they can be trading
Perfecto
I can have traded you can have traded she can have traded we can have traded you can have traded they can have traded
Perfecto con V-ing
I can have been trading you can have been trading she can have been trading we can have been trading you can have been trading they can have been trading
Negación
Forma simple
I cannot trade you cannot trade she cannot trade we cannot trade you cannot trade they cannot trade
Forma con V-ing
I cannot be trading you cannot be trading she cannot be trading we cannot be trading you cannot be trading they cannot be trading
Perfecto
I cannot have traded you cannot have traded she cannot have traded we cannot have traded you cannot have traded they cannot have traded
Perfecto con V-ing
I cannot have been trading you cannot have been trading she 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 she trade? can we trade? can you trade? can they trade?
Forma con V-ing
can I be trading? can you be trading? can she be trading? can we be trading? can you be trading? can they be trading?
Perfecto
can I have traded? can you have traded? can she have traded? can we have traded? can you have traded? can they have traded?
Perfecto con V-ing
can I have been trading? can you have been trading? can she have been trading? can we have been trading? can you have been trading? can they have been trading?
Forma interro-negativa
Forma simple
can I not trade? can you not trade? can she not trade? can we not trade? can you not trade? can they not trade?
Forma con V-ing
can I not be trading? can you not be trading? can she not be trading? can we not be trading? can you not be trading? can they not be trading?
Perfecto
can I not have traded? can you not have traded? can she not have traded? can we not have traded? can you not have traded? can they not have traded?
Perfecto con V-ing
can I not have been trading? can you not have been trading? can she not have been trading? can we not have been trading? can you not have been trading? can they not have been trading?