could trade
Regular verb: trade - traded- traded

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

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I couldn't trade
you couldn't trade
she couldn't trade
we couldn't trade
you couldn't trade
they couldn't trade 	I couldn't be trading
you couldn't be trading
she couldn't be trading
we couldn't be trading
you couldn't be trading
they couldn't be trading	I couldn't have traded
you couldn't have traded
she couldn't have traded
we couldn't have traded
you couldn't have traded
they couldn't have traded	I couldn't have been trading
you couldn't have been trading
she couldn't have been trading
we couldn't have been trading
you couldn't have been trading
they couldn't have been trading	

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

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
couldn't I trade?
couldn't you trade?
couldn't she trade?
couldn't we trade?
couldn't you trade?
couldn't they trade? 	couldn't I be trading?
couldn't you be trading?
couldn't she be trading?
couldn't we be trading?
couldn't you be trading?
couldn't they be trading? 	couldn't I have traded?
couldn't you have traded?
couldn't she have traded?
couldn't we have traded?
couldn't you have traded?
couldn't they have traded? 	couldn't I have been trading?
couldn't you have been trading?
couldn't she have been trading?
couldn't we have been trading?
couldn't you have been trading?
couldn't they have been trading?