I can fleer you can fleer he can fleer we can fleer you can fleer they can fleer
V-ing form
I can be fleering you can be fleering he can be fleering we can be fleering you can be fleering they can be fleering
Perfect
I can have fleered you can have fleered he can have fleered we can have fleered you can have fleered they can have fleered
V-ing perfect
I can have been fleering you can have been fleering he can have been fleering we can have been fleering you can have been fleering they can have been fleering
Negation
Simple form
I can't fleer you can't fleer he can't fleer we can't fleer you can't fleer they can't fleer
V-ing form
I can't be fleering you can't be fleering he can't be fleering we can't be fleering you can't be fleering they can't be fleering
Perfect
I can't have fleered you can't have fleered he can't have fleered we can't have fleered you can't have fleered they can't have fleered
V-ing perfect
I can't have been fleering you can't have been fleering he can't have been fleering we can't have been fleering you can't have been fleering they can't have been fleering
Interrogative form
Simple form
can I fleer? can you fleer? can he fleer? can we fleer? can you fleer? can they fleer?
V-ing form
can I be fleering? can you be fleering? can he be fleering? can we be fleering? can you be fleering? can they be fleering?
Perfect
can I have fleered? can you have fleered? can he have fleered? can we have fleered? can you have fleered? can they have fleered?
V-ing perfect
can I have been fleering? can you have been fleering? can he have been fleering? can we have been fleering? can you have been fleering? can they have been fleering?
Interro-negative form
Simple form
can't I fleer? can't you fleer? can't he fleer? can't we fleer? can't you fleer? can't they fleer?
V-ing form
can't I be fleering? can't you be fleering? can't he be fleering? can't we be fleering? can't you be fleering? can't they be fleering?
Perfect
can't I have fleered? can't you have fleered? can't he have fleered? can't we have fleered? can't you have fleered? can't they have fleered?
V-ing perfect
can't I have been fleering? can't you have been fleering? can't he have been fleering? can't we have been fleering? can't you have been fleering? can't they have been fleering?