I could joust you could joust he could joust we could joust you could joust they could joust
V-ing form
I could be jousting you could be jousting he could be jousting we could be jousting you could be jousting they could be jousting
Perfect
I could have jousted you could have jousted he could have jousted we could have jousted you could have jousted they could have jousted
V-ing perfect
I could have been jousting you could have been jousting he could have been jousting we could have been jousting you could have been jousting they could have been jousting
Negation
Simple form
I could not joust you could not joust he could not joust we could not joust you could not joust they could not joust
V-ing form
I could not be jousting you could not be jousting he could not be jousting we could not be jousting you could not be jousting they could not be jousting
Perfect
I could not have jousted you could not have jousted he could not have jousted we could not have jousted you could not have jousted they could not have jousted
V-ing perfect
I could not have been jousting you could not have been jousting he could not have been jousting we could not have been jousting you could not have been jousting they could not have been jousting
Interrogative form
Simple form
could I joust? could you joust? could he joust? could we joust? could you joust? could they joust?
V-ing form
could I be jousting? could you be jousting? could he be jousting? could we be jousting? could you be jousting? could they be jousting?
Perfect
could I have jousted? could you have jousted? could he have jousted? could we have jousted? could you have jousted? could they have jousted?
V-ing perfect
could I have been jousting? could you have been jousting? could he have been jousting? could we have been jousting? could you have been jousting? could they have been jousting?
Interro-negative form
Simple form
could I not joust? could you not joust? could he not joust? could we not joust? could you not joust? could they not joust?
V-ing form
could I not be jousting? could you not be jousting? could he not be jousting? could we not be jousting? could you not be jousting? could they not be jousting?
Perfect
could I not have jousted? could you not have jousted? could he not have jousted? could we not have jousted? could you not have jousted? could they not have jousted?
V-ing perfect
could I not have been jousting? could you not have been jousting? could he not have been jousting? could we not have been jousting? could you not have been jousting? could they not have been jousting?