I could charter you could charter he could charter we could charter you could charter they could charter
V-ing form
I could be chartering you could be chartering he could be chartering we could be chartering you could be chartering they could be chartering
Perfect
I could have chartered you could have chartered he could have chartered we could have chartered you could have chartered they could have chartered
V-ing perfect
I could have been chartering you could have been chartering he could have been chartering we could have been chartering you could have been chartering they could have been chartering
Negation
Simple form
I could not charter you could not charter he could not charter we could not charter you could not charter they could not charter
V-ing form
I could not be chartering you could not be chartering he could not be chartering we could not be chartering you could not be chartering they could not be chartering
Perfect
I could not have chartered you could not have chartered he could not have chartered we could not have chartered you could not have chartered they could not have chartered
V-ing perfect
I could not have been chartering you could not have been chartering he could not have been chartering we could not have been chartering you could not have been chartering they could not have been chartering
Interrogative form
Simple form
could I charter? could you charter? could he charter? could we charter? could you charter? could they charter?
V-ing form
could I be chartering? could you be chartering? could he be chartering? could we be chartering? could you be chartering? could they be chartering?
Perfect
could I have chartered? could you have chartered? could he have chartered? could we have chartered? could you have chartered? could they have chartered?
V-ing perfect
could I have been chartering? could you have been chartering? could he have been chartering? could we have been chartering? could you have been chartering? could they have been chartering?
Interro-negative form
Simple form
could I not charter? could you not charter? could he not charter? could we not charter? could you not charter? could they not charter?
V-ing form
could I not be chartering? could you not be chartering? could he not be chartering? could we not be chartering? could you not be chartering? could they not be chartering?
Perfect
could I not have chartered? could you not have chartered? could he not have chartered? could we not have chartered? could you not have chartered? could they not have chartered?
V-ing perfect
could I not have been chartering? could you not have been chartering? could he not have been chartering? could we not have been chartering? could you not have been chartering? could they not have been chartering?