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