I could restart you could restart he could restart we could restart you could restart they could restart
V-ing form
I could be restarting you could be restarting he could be restarting we could be restarting you could be restarting they could be restarting
Perfect
I could have restarted you could have restarted he could have restarted we could have restarted you could have restarted they could have restarted
V-ing perfect
I could have been restarting you could have been restarting he could have been restarting we could have been restarting you could have been restarting they could have been restarting
Negation
Simple form
I could not restart you could not restart he could not restart we could not restart you could not restart they could not restart
V-ing form
I could not be restarting you could not be restarting he could not be restarting we could not be restarting you could not be restarting they could not be restarting
Perfect
I could not have restarted you could not have restarted he could not have restarted we could not have restarted you could not have restarted they could not have restarted
V-ing perfect
I could not have been restarting you could not have been restarting he could not have been restarting we could not have been restarting you could not have been restarting they could not have been restarting
Interrogative form
Simple form
could I restart? could you restart? could he restart? could we restart? could you restart? could they restart?
V-ing form
could I be restarting? could you be restarting? could he be restarting? could we be restarting? could you be restarting? could they be restarting?
Perfect
could I have restarted? could you have restarted? could he have restarted? could we have restarted? could you have restarted? could they have restarted?
V-ing perfect
could I have been restarting? could you have been restarting? could he have been restarting? could we have been restarting? could you have been restarting? could they have been restarting?
Interro-negative form
Simple form
could I not restart? could you not restart? could he not restart? could we not restart? could you not restart? could they not restart?
V-ing form
could I not be restarting? could you not be restarting? could he not be restarting? could we not be restarting? could you not be restarting? could they not be restarting?
Perfect
could I not have restarted? could you not have restarted? could he not have restarted? could we not have restarted? could you not have restarted? could they not have restarted?
V-ing perfect
could I not have been restarting? could you not have been restarting? could he not have been restarting? could we not have been restarting? could you not have been restarting? could they not have been restarting?