I could simper you could simper she could simper we could simper you could simper they could simper
V-ing form
I could be simpering you could be simpering she could be simpering we could be simpering you could be simpering they could be simpering
Perfect
I could have simpered you could have simpered she could have simpered we could have simpered you could have simpered they could have simpered
V-ing perfect
I could have been simpering you could have been simpering she could have been simpering we could have been simpering you could have been simpering they could have been simpering
Negation
Simple form
I could not simper you could not simper she could not simper we could not simper you could not simper they could not simper
V-ing form
I could not be simpering you could not be simpering she could not be simpering we could not be simpering you could not be simpering they could not be simpering
Perfect
I could not have simpered you could not have simpered she could not have simpered we could not have simpered you could not have simpered they could not have simpered
V-ing perfect
I could not have been simpering you could not have been simpering she could not have been simpering we could not have been simpering you could not have been simpering they could not have been simpering
Interrogative form
Simple form
could I simper? could you simper? could she simper? could we simper? could you simper? could they simper?
V-ing form
could I be simpering? could you be simpering? could she be simpering? could we be simpering? could you be simpering? could they be simpering?
Perfect
could I have simpered? could you have simpered? could she have simpered? could we have simpered? could you have simpered? could they have simpered?
V-ing perfect
could I have been simpering? could you have been simpering? could she have been simpering? could we have been simpering? could you have been simpering? could they have been simpering?
Interro-negative form
Simple form
could I not simper? could you not simper? could she not simper? could we not simper? could you not simper? could they not simper?
V-ing form
could I not be simpering? could you not be simpering? could she not be simpering? could we not be simpering? could you not be simpering? could they not be simpering?
Perfect
could I not have simpered? could you not have simpered? could she not have simpered? could we not have simpered? could you not have simpered? could they not have simpered?
V-ing perfect
could I not have been simpering? could you not have been simpering? could she not have been simpering? could we not have been simpering? could you not have been simpering? could they not have been simpering?