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 couldn't joust you couldn't joust he couldn't joust we couldn't joust you couldn't joust they couldn't joust
V-ing form
I couldn't be jousting you couldn't be jousting he couldn't be jousting we couldn't be jousting you couldn't be jousting they couldn't be jousting
Perfect
I couldn't have jousted you couldn't have jousted he couldn't have jousted we couldn't have jousted you couldn't have jousted they couldn't have jousted
V-ing perfect
I couldn't have been jousting you couldn't have been jousting he couldn't have been jousting we couldn't have been jousting you couldn't have been jousting they couldn't 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
couldn't I joust? couldn't you joust? couldn't he joust? couldn't we joust? couldn't you joust? couldn't they joust?
V-ing form
couldn't I be jousting? couldn't you be jousting? couldn't he be jousting? couldn't we be jousting? couldn't you be jousting? couldn't they be jousting?
Perfect
couldn't I have jousted? couldn't you have jousted? couldn't he have jousted? couldn't we have jousted? couldn't you have jousted? couldn't they have jousted?
V-ing perfect
couldn't I have been jousting? couldn't you have been jousting? couldn't he have been jousting? couldn't we have been jousting? couldn't you have been jousting? couldn't they have been jousting?