I could barbecue you could barbecue he could barbecue we could barbecue you could barbecue they could barbecue
V-ing form
I could be barbecuing you could be barbecuing he could be barbecuing we could be barbecuing you could be barbecuing they could be barbecuing
Perfect
I could have barbecued you could have barbecued he could have barbecued we could have barbecued you could have barbecued they could have barbecued
V-ing perfect
I could have been barbecuing you could have been barbecuing he could have been barbecuing we could have been barbecuing you could have been barbecuing they could have been barbecuing
Negation
Simple form
I could not barbecue you could not barbecue he could not barbecue we could not barbecue you could not barbecue they could not barbecue
V-ing form
I could not be barbecuing you could not be barbecuing he could not be barbecuing we could not be barbecuing you could not be barbecuing they could not be barbecuing
Perfect
I could not have barbecued you could not have barbecued he could not have barbecued we could not have barbecued you could not have barbecued they could not have barbecued
V-ing perfect
I could not have been barbecuing you could not have been barbecuing he could not have been barbecuing we could not have been barbecuing you could not have been barbecuing they could not have been barbecuing
Interrogative form
Simple form
could I barbecue? could you barbecue? could he barbecue? could we barbecue? could you barbecue? could they barbecue?
V-ing form
could I be barbecuing? could you be barbecuing? could he be barbecuing? could we be barbecuing? could you be barbecuing? could they be barbecuing?
Perfect
could I have barbecued? could you have barbecued? could he have barbecued? could we have barbecued? could you have barbecued? could they have barbecued?
V-ing perfect
could I have been barbecuing? could you have been barbecuing? could he have been barbecuing? could we have been barbecuing? could you have been barbecuing? could they have been barbecuing?
Interro-negative form
Simple form
could I not barbecue? could you not barbecue? could he not barbecue? could we not barbecue? could you not barbecue? could they not barbecue?
V-ing form
could I not be barbecuing? could you not be barbecuing? could he not be barbecuing? could we not be barbecuing? could you not be barbecuing? could they not be barbecuing?
Perfect
could I not have barbecued? could you not have barbecued? could he not have barbecued? could we not have barbecued? could you not have barbecued? could they not have barbecued?
V-ing perfect
could I not have been barbecuing? could you not have been barbecuing? could he not have been barbecuing? could we not have been barbecuing? could you not have been barbecuing? could they not have been barbecuing?