can trade
Regular verb: trade - traded- traded

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can trade
you can trade
he can trade
we can trade
you can trade
they can trade 	I can be trading
you can be trading
he can be trading
we can be trading
you can be trading
they can be trading	I can have traded
you can have traded
he 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
he 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 can't trade
you can't trade
he can't trade
we can't trade
you can't trade
they can't trade 	I can't be trading
you can't be trading
he can't be trading
we can't be trading
you can't be trading
they can't be trading	I can't have traded
you can't have traded
he can't have traded
we can't have traded
you can't have traded
they can't have traded	I can't have been trading
you can't have been trading
he can't have been trading
we can't have been trading
you can't have been trading
they can't have been trading	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I trade?
can you trade?
can he trade?
can we trade?
can you trade?
can they trade? 	can I be trading?
can you be trading?
can he be trading?
can we be trading?
can you be trading?
can they be trading? 	can I have traded?
can you have traded?
can he 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 he 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't I trade?
can't you trade?
can't he trade?
can't we trade?
can't you trade?
can't they trade? 	can't I be trading?
can't you be trading?
can't he be trading?
can't we be trading?
can't you be trading?
can't they be trading? 	can't I have traded?
can't you have traded?
can't he have traded?
can't we have traded?
can't you have traded?
can't they have traded? 	can't I have been trading?
can't you have been trading?
can't he have been trading?
can't we have been trading?
can't you have been trading?
can't they have been trading?