I could photostat you could photostat he could photostat we could photostat you could photostat they could photostat
V-ing form
I could be photostatting you could be photostatting he could be photostatting we could be photostatting you could be photostatting they could be photostatting
Perfect
I could have photostatted you could have photostatted he could have photostatted we could have photostatted you could have photostatted they could have photostatted
V-ing perfect
I could have been photostatting you could have been photostatting he could have been photostatting we could have been photostatting you could have been photostatting they could have been photostatting
Negation
Simple form
I could not photostat you could not photostat he could not photostat we could not photostat you could not photostat they could not photostat
V-ing form
I could not be photostatting you could not be photostatting he could not be photostatting we could not be photostatting you could not be photostatting they could not be photostatting
Perfect
I could not have photostatted you could not have photostatted he could not have photostatted we could not have photostatted you could not have photostatted they could not have photostatted
V-ing perfect
I could not have been photostatting you could not have been photostatting he could not have been photostatting we could not have been photostatting you could not have been photostatting they could not have been photostatting
Interrogative form
Simple form
could I photostat? could you photostat? could he photostat? could we photostat? could you photostat? could they photostat?
V-ing form
could I be photostatting? could you be photostatting? could he be photostatting? could we be photostatting? could you be photostatting? could they be photostatting?
Perfect
could I have photostatted? could you have photostatted? could he have photostatted? could we have photostatted? could you have photostatted? could they have photostatted?
V-ing perfect
could I have been photostatting? could you have been photostatting? could he have been photostatting? could we have been photostatting? could you have been photostatting? could they have been photostatting?
Interro-negative form
Simple form
could I not photostat? could you not photostat? could he not photostat? could we not photostat? could you not photostat? could they not photostat?
V-ing form
could I not be photostatting? could you not be photostatting? could he not be photostatting? could we not be photostatting? could you not be photostatting? could they not be photostatting?
Perfect
could I not have photostatted? could you not have photostatted? could he not have photostatted? could we not have photostatted? could you not have photostatted? could they not have photostatted?
V-ing perfect
could I not have been photostatting? could you not have been photostatting? could he not have been photostatting? could we not have been photostatting? could you not have been photostatting? could they not have been photostatting?