I could make you could make he could make we could make you could make they could make
V-ing form
I could be making you could be making he could be making we could be making you could be making they could be making
Perfect
I could have made you could have made he could have made we could have made you could have made they could have made
V-ing perfect
I could have been making you could have been making he could have been making we could have been making you could have been making they could have been making
Negation
Simple form
I could not make you could not make he could not make we could not make you could not make they could not make
V-ing form
I could not be making you could not be making he could not be making we could not be making you could not be making they could not be making
Perfect
I could not have made you could not have made he could not have made we could not have made you could not have made they could not have made
V-ing perfect
I could not have been making you could not have been making he could not have been making we could not have been making you could not have been making they could not have been making
Interrogative form
Simple form
could I make? could you make? could he make? could we make? could you make? could they make?
V-ing form
could I be making? could you be making? could he be making? could we be making? could you be making? could they be making?
Perfect
could I have made? could you have made? could he have made? could we have made? could you have made? could they have made?
V-ing perfect
could I have been making? could you have been making? could he have been making? could we have been making? could you have been making? could they have been making?
Interro-negative form
Simple form
could I not make? could you not make? could he not make? could we not make? could you not make? could they not make?
V-ing form
could I not be making? could you not be making? could he not be making? could we not be making? could you not be making? could they not be making?
Perfect
could I not have made? could you not have made? could he not have made? could we not have made? could you not have made? could they not have made?
V-ing perfect
could I not have been making? could you not have been making? could he not have been making? could we not have been making? could you not have been making? could they not have been making?