I could barter you could barter he could barter we could barter you could barter they could barter
V-ing form
I could be bartering you could be bartering he could be bartering we could be bartering you could be bartering they could be bartering
Perfect
I could have bartered you could have bartered he could have bartered we could have bartered you could have bartered they could have bartered
V-ing perfect
I could have been bartering you could have been bartering he could have been bartering we could have been bartering you could have been bartering they could have been bartering
Negation
Simple form
I couldn't barter you couldn't barter he couldn't barter we couldn't barter you couldn't barter they couldn't barter
V-ing form
I couldn't be bartering you couldn't be bartering he couldn't be bartering we couldn't be bartering you couldn't be bartering they couldn't be bartering
Perfect
I couldn't have bartered you couldn't have bartered he couldn't have bartered we couldn't have bartered you couldn't have bartered they couldn't have bartered
V-ing perfect
I couldn't have been bartering you couldn't have been bartering he couldn't have been bartering we couldn't have been bartering you couldn't have been bartering they couldn't have been bartering
Interrogative form
Simple form
could I barter? could you barter? could he barter? could we barter? could you barter? could they barter?
V-ing form
could I be bartering? could you be bartering? could he be bartering? could we be bartering? could you be bartering? could they be bartering?
Perfect
could I have bartered? could you have bartered? could he have bartered? could we have bartered? could you have bartered? could they have bartered?
V-ing perfect
could I have been bartering? could you have been bartering? could he have been bartering? could we have been bartering? could you have been bartering? could they have been bartering?
Interro-negative form
Simple form
couldn't I barter? couldn't you barter? couldn't he barter? couldn't we barter? couldn't you barter? couldn't they barter?
V-ing form
couldn't I be bartering? couldn't you be bartering? couldn't he be bartering? couldn't we be bartering? couldn't you be bartering? couldn't they be bartering?
Perfect
couldn't I have bartered? couldn't you have bartered? couldn't he have bartered? couldn't we have bartered? couldn't you have bartered? couldn't they have bartered?
V-ing perfect
couldn't I have been bartering? couldn't you have been bartering? couldn't he have been bartering? couldn't we have been bartering? couldn't you have been bartering? couldn't they have been bartering?