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