English verb conjugation
COULD TRADE

Regular verb: trade - traded - traded

Affirmation

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