I could somersault you could somersault he could somersault we could somersault you could somersault they could somersault
V-ing form
I could be somersaulting you could be somersaulting he could be somersaulting we could be somersaulting you could be somersaulting they could be somersaulting
Perfect
I could have somersaulted you could have somersaulted he could have somersaulted we could have somersaulted you could have somersaulted they could have somersaulted
V-ing perfect
I could have been somersaulting you could have been somersaulting he could have been somersaulting we could have been somersaulting you could have been somersaulting they could have been somersaulting
Negation
Simple form
I could not somersault you could not somersault he could not somersault we could not somersault you could not somersault they could not somersault
V-ing form
I could not be somersaulting you could not be somersaulting he could not be somersaulting we could not be somersaulting you could not be somersaulting they could not be somersaulting
Perfect
I could not have somersaulted you could not have somersaulted he could not have somersaulted we could not have somersaulted you could not have somersaulted they could not have somersaulted
V-ing perfect
I could not have been somersaulting you could not have been somersaulting he could not have been somersaulting we could not have been somersaulting you could not have been somersaulting they could not have been somersaulting
Interrogative form
Simple form
could I somersault? could you somersault? could he somersault? could we somersault? could you somersault? could they somersault?
V-ing form
could I be somersaulting? could you be somersaulting? could he be somersaulting? could we be somersaulting? could you be somersaulting? could they be somersaulting?
Perfect
could I have somersaulted? could you have somersaulted? could he have somersaulted? could we have somersaulted? could you have somersaulted? could they have somersaulted?
V-ing perfect
could I have been somersaulting? could you have been somersaulting? could he have been somersaulting? could we have been somersaulting? could you have been somersaulting? could they have been somersaulting?
Interro-negative form
Simple form
could I not somersault? could you not somersault? could he not somersault? could we not somersault? could you not somersault? could they not somersault?
V-ing form
could I not be somersaulting? could you not be somersaulting? could he not be somersaulting? could we not be somersaulting? could you not be somersaulting? could they not be somersaulting?
Perfect
could I not have somersaulted? could you not have somersaulted? could he not have somersaulted? could we not have somersaulted? could you not have somersaulted? could they not have somersaulted?
V-ing perfect
could I not have been somersaulting? could you not have been somersaulting? could he not have been somersaulting? could we not have been somersaulting? could you not have been somersaulting? could they not have been somersaulting?