I could simmer you could simmer he could simmer we could simmer you could simmer they could simmer
V-ing form
I could be simmering you could be simmering he could be simmering we could be simmering you could be simmering they could be simmering
Perfect
I could have simmered you could have simmered he could have simmered we could have simmered you could have simmered they could have simmered
V-ing perfect
I could have been simmering you could have been simmering he could have been simmering we could have been simmering you could have been simmering they could have been simmering
Negation
Simple form
I could not simmer you could not simmer he could not simmer we could not simmer you could not simmer they could not simmer
V-ing form
I could not be simmering you could not be simmering he could not be simmering we could not be simmering you could not be simmering they could not be simmering
Perfect
I could not have simmered you could not have simmered he could not have simmered we could not have simmered you could not have simmered they could not have simmered
V-ing perfect
I could not have been simmering you could not have been simmering he could not have been simmering we could not have been simmering you could not have been simmering they could not have been simmering
Interrogative form
Simple form
could I simmer? could you simmer? could he simmer? could we simmer? could you simmer? could they simmer?
V-ing form
could I be simmering? could you be simmering? could he be simmering? could we be simmering? could you be simmering? could they be simmering?
Perfect
could I have simmered? could you have simmered? could he have simmered? could we have simmered? could you have simmered? could they have simmered?
V-ing perfect
could I have been simmering? could you have been simmering? could he have been simmering? could we have been simmering? could you have been simmering? could they have been simmering?
Interro-negative form
Simple form
could I not simmer? could you not simmer? could he not simmer? could we not simmer? could you not simmer? could they not simmer?
V-ing form
could I not be simmering? could you not be simmering? could he not be simmering? could we not be simmering? could you not be simmering? could they not be simmering?
Perfect
could I not have simmered? could you not have simmered? could he not have simmered? could we not have simmered? could you not have simmered? could they not have simmered?
V-ing perfect
could I not have been simmering? could you not have been simmering? could he not have been simmering? could we not have been simmering? could you not have been simmering? could they not have been simmering?