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 couldn't barbecue you couldn't barbecue he couldn't barbecue we couldn't barbecue you couldn't barbecue they couldn't barbecue
V-ing form
I couldn't be barbecuing you couldn't be barbecuing he couldn't be barbecuing we couldn't be barbecuing you couldn't be barbecuing they couldn't be barbecuing
Perfect
I couldn't have barbecued you couldn't have barbecued he couldn't have barbecued we couldn't have barbecued you couldn't have barbecued they couldn't have barbecued
V-ing perfect
I couldn't have been barbecuing you couldn't have been barbecuing he couldn't have been barbecuing we couldn't have been barbecuing you couldn't have been barbecuing they couldn't 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
couldn't I barbecue? couldn't you barbecue? couldn't he barbecue? couldn't we barbecue? couldn't you barbecue? couldn't they barbecue?
V-ing form
couldn't I be barbecuing? couldn't you be barbecuing? couldn't he be barbecuing? couldn't we be barbecuing? couldn't you be barbecuing? couldn't they be barbecuing?
Perfect
couldn't I have barbecued? couldn't you have barbecued? couldn't he have barbecued? couldn't we have barbecued? couldn't you have barbecued? couldn't they have barbecued?
V-ing perfect
couldn't I have been barbecuing? couldn't you have been barbecuing? couldn't he have been barbecuing? couldn't we have been barbecuing? couldn't you have been barbecuing? couldn't they have been barbecuing?