I could set you could set she could set we could set you could set they could set
V-ing form
I could be setting you could be setting she could be setting we could be setting you could be setting they could be setting
Perfect
I could have set you could have set she 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 she 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 she 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 she 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 she 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 she 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 she set? could we set? could you set? could they set?
V-ing form
could I be setting? could you be setting? could she be setting? could we be setting? could you be setting? could they be setting?
Perfect
could I have set? could you have set? could she 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 she 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 she 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 she 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 she 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 she have been setting? couldn't we have been setting? couldn't you have been setting? couldn't they have been setting?