I could shimmer you could shimmer he could shimmer we could shimmer you could shimmer they could shimmer
V-ing form
I could be shimmering you could be shimmering he could be shimmering we could be shimmering you could be shimmering they could be shimmering
Perfect
I could have shimmered you could have shimmered he could have shimmered we could have shimmered you could have shimmered they could have shimmered
V-ing perfect
I could have been shimmering you could have been shimmering he could have been shimmering we could have been shimmering you could have been shimmering they could have been shimmering
Negation
Simple form
I could not shimmer you could not shimmer he could not shimmer we could not shimmer you could not shimmer they could not shimmer
V-ing form
I could not be shimmering you could not be shimmering he could not be shimmering we could not be shimmering you could not be shimmering they could not be shimmering
Perfect
I could not have shimmered you could not have shimmered he could not have shimmered we could not have shimmered you could not have shimmered they could not have shimmered
V-ing perfect
I could not have been shimmering you could not have been shimmering he could not have been shimmering we could not have been shimmering you could not have been shimmering they could not have been shimmering
Interrogative form
Simple form
could I shimmer? could you shimmer? could he shimmer? could we shimmer? could you shimmer? could they shimmer?
V-ing form
could I be shimmering? could you be shimmering? could he be shimmering? could we be shimmering? could you be shimmering? could they be shimmering?
Perfect
could I have shimmered? could you have shimmered? could he have shimmered? could we have shimmered? could you have shimmered? could they have shimmered?
V-ing perfect
could I have been shimmering? could you have been shimmering? could he have been shimmering? could we have been shimmering? could you have been shimmering? could they have been shimmering?
Interro-negative form
Simple form
could I not shimmer? could you not shimmer? could he not shimmer? could we not shimmer? could you not shimmer? could they not shimmer?
V-ing form
could I not be shimmering? could you not be shimmering? could he not be shimmering? could we not be shimmering? could you not be shimmering? could they not be shimmering?
Perfect
could I not have shimmered? could you not have shimmered? could he not have shimmered? could we not have shimmered? could you not have shimmered? could they not have shimmered?
V-ing perfect
could I not have been shimmering? could you not have been shimmering? could he not have been shimmering? could we not have been shimmering? could you not have been shimmering? could they not have been shimmering?