can trade
Regular verb: trade - traded- traded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can trade
you can trade
she can trade
we can trade
you can trade
they can trade 	I can be trading
you can be trading
she can be trading
we can be trading
you can be trading
they can be trading	I can have traded
you can have traded
she can have traded
we can have traded
you can have traded
they can have traded	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	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot trade
you cannot trade
she cannot trade
we cannot trade
you cannot trade
they cannot trade 	I cannot be trading
you cannot be trading
she cannot be trading
we cannot be trading
you cannot be trading
they cannot be trading	I cannot have traded
you cannot have traded
she cannot have traded
we cannot have traded
you cannot have traded
they cannot have traded	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	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I trade?
can you trade?
can she trade?
can we trade?
can you trade?
can they trade? 	can I be trading?
can you be trading?
can she be trading?
can we be trading?
can you be trading?
can they be trading? 	can I have traded?
can you have traded?
can she have traded?
can we have traded?
can you have traded?
can they have traded? 	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? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not trade?
can you not trade?
can she not trade?
can we not trade?
can you not trade?
can they not trade? 	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? 	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? 	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?