I could set you could set he could set we could set you could set they could set
V-ing form
I could be setting you could be setting he could be setting we could be setting you could be setting they could be setting
Perfect
I could have set you could have set he could have set we could have set you could have set they could have set
V-ing perfect
I could have been setting you could have been setting he could have been setting we could have been setting you could have been setting they could have been setting
Negation
Simple form
I couldn't set you couldn't set he couldn't set we couldn't set you couldn't set they couldn't set
V-ing form
I couldn't be setting you couldn't be setting he couldn't be setting we couldn't be setting you couldn't be setting they couldn't be setting
Perfect
I couldn't have set you couldn't have set he couldn't have set we couldn't have set you couldn't have set they couldn't have set
V-ing perfect
I couldn't have been setting you couldn't have been setting he couldn't have been setting we couldn't have been setting you couldn't have been setting they couldn't have been setting
Interrogative form
Simple form
could I set? could you set? could he set? could we set? could you set? could they set?
V-ing form
could I be setting? could you be setting? could he be setting? could we be setting? could you be setting? could they be setting?
Perfect
could I have set? could you have set? could he have set? could we have set? could you have set? could they have set?
V-ing perfect
could I have been setting? could you have been setting? could he have been setting? could we have been setting? could you have been setting? could they have been setting?
Interro-negative form
Simple form
couldn't I set? couldn't you set? couldn't he set? couldn't we set? couldn't you set? couldn't they set?
V-ing form
couldn't I be setting? couldn't you be setting? couldn't he be setting? couldn't we be setting? couldn't you be setting? couldn't they be setting?
Perfect
couldn't I have set? couldn't you have set? couldn't he have set? couldn't we have set? couldn't you have set? couldn't they have set?
V-ing perfect
couldn't I have been setting? couldn't you have been setting? couldn't he have been setting? couldn't we have been setting? couldn't you have been setting? couldn't they have been setting?