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 cannot fleer you cannot fleer he cannot fleer we cannot fleer you cannot fleer they cannot fleer
V-ing form
I cannot be fleering you cannot be fleering he cannot be fleering we cannot be fleering you cannot be fleering they cannot be fleering
Perfect
I cannot have fleered you cannot have fleered he cannot have fleered we cannot have fleered you cannot have fleered they cannot have fleered
V-ing perfect
I cannot have been fleering you cannot have been fleering he cannot have been fleering we cannot have been fleering you cannot have been fleering they cannot 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 I not fleer? can you not fleer? can he not fleer? can we not fleer? can you not fleer? can they not fleer?
V-ing form
can I not be fleering? can you not be fleering? can he not be fleering? can we not be fleering? can you not be fleering? can they not be fleering?
Perfect
can I not have fleered? can you not have fleered? can he not have fleered? can we not have fleered? can you not have fleered? can they not have fleered?
V-ing perfect
can I not have been fleering? can you not have been fleering? can he not have been fleering? can we not have been fleering? can you not have been fleering? can they not have been fleering?