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 couldn't make you couldn't make he couldn't make we couldn't make you couldn't make they couldn't make
V-ing form
I couldn't be making you couldn't be making he couldn't be making we couldn't be making you couldn't be making they couldn't be making
Perfect
I couldn't have made you couldn't have made he couldn't have made we couldn't have made you couldn't have made they couldn't have made
V-ing perfect
I couldn't have been making you couldn't have been making he couldn't have been making we couldn't have been making you couldn't have been making they couldn't 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
couldn't I make? couldn't you make? couldn't he make? couldn't we make? couldn't you make? couldn't they make?
V-ing form
couldn't I be making? couldn't you be making? couldn't he be making? couldn't we be making? couldn't you be making? couldn't they be making?
Perfect
couldn't I have made? couldn't you have made? couldn't he have made? couldn't we have made? couldn't you have made? couldn't they have made?
V-ing perfect
couldn't I have been making? couldn't you have been making? couldn't he have been making? couldn't we have been making? couldn't you have been making? couldn't they have been making?