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