I can brood you can brood he can brood we can brood you can brood they can brood
V-ing form
I can be brooding you can be brooding he can be brooding we can be brooding you can be brooding they can be brooding
Perfect
I can have brooded you can have brooded he can have brooded we can have brooded you can have brooded they can have brooded
V-ing perfect
I can have been brooding you can have been brooding he can have been brooding we can have been brooding you can have been brooding they can have been brooding
Negation
Simple form
I can't brood you can't brood he can't brood we can't brood you can't brood they can't brood
V-ing form
I can't be brooding you can't be brooding he can't be brooding we can't be brooding you can't be brooding they can't be brooding
Perfect
I can't have brooded you can't have brooded he can't have brooded we can't have brooded you can't have brooded they can't have brooded
V-ing perfect
I can't have been brooding you can't have been brooding he can't have been brooding we can't have been brooding you can't have been brooding they can't have been brooding
Interrogative form
Simple form
can I brood? can you brood? can he brood? can we brood? can you brood? can they brood?
V-ing form
can I be brooding? can you be brooding? can he be brooding? can we be brooding? can you be brooding? can they be brooding?
Perfect
can I have brooded? can you have brooded? can he have brooded? can we have brooded? can you have brooded? can they have brooded?
V-ing perfect
can I have been brooding? can you have been brooding? can he have been brooding? can we have been brooding? can you have been brooding? can they have been brooding?
Interro-negative form
Simple form
can't I brood? can't you brood? can't he brood? can't we brood? can't you brood? can't they brood?
V-ing form
can't I be brooding? can't you be brooding? can't he be brooding? can't we be brooding? can't you be brooding? can't they be brooding?
Perfect
can't I have brooded? can't you have brooded? can't he have brooded? can't we have brooded? can't you have brooded? can't they have brooded?
V-ing perfect
can't I have been brooding? can't you have been brooding? can't he have been brooding? can't we have been brooding? can't you have been brooding? can't they have been brooding?