I could lead you could lead she could lead we could lead you could lead they could lead
V-ing form
I could be leading you could be leading she could be leading we could be leading you could be leading they could be leading
Perfect
I could have led you could have led she could have led we could have led you could have led they could have led
V-ing perfect
I could have been leading you could have been leading she could have been leading we could have been leading you could have been leading they could have been leading
Negation
Simple form
I couldn't lead you couldn't lead she couldn't lead we couldn't lead you couldn't lead they couldn't lead
V-ing form
I couldn't be leading you couldn't be leading she couldn't be leading we couldn't be leading you couldn't be leading they couldn't be leading
Perfect
I couldn't have led you couldn't have led she couldn't have led we couldn't have led you couldn't have led they couldn't have led
V-ing perfect
I couldn't have been leading you couldn't have been leading she couldn't have been leading we couldn't have been leading you couldn't have been leading they couldn't have been leading
Interrogative form
Simple form
could I lead? could you lead? could she lead? could we lead? could you lead? could they lead?
V-ing form
could I be leading? could you be leading? could she be leading? could we be leading? could you be leading? could they be leading?
Perfect
could I have led? could you have led? could she have led? could we have led? could you have led? could they have led?
V-ing perfect
could I have been leading? could you have been leading? could she have been leading? could we have been leading? could you have been leading? could they have been leading?
Interro-negative form
Simple form
couldn't I lead? couldn't you lead? couldn't she lead? couldn't we lead? couldn't you lead? couldn't they lead?
V-ing form
couldn't I be leading? couldn't you be leading? couldn't she be leading? couldn't we be leading? couldn't you be leading? couldn't they be leading?
Perfect
couldn't I have led? couldn't you have led? couldn't she have led? couldn't we have led? couldn't you have led? couldn't they have led?
V-ing perfect
couldn't I have been leading? couldn't you have been leading? couldn't she have been leading? couldn't we have been leading? couldn't you have been leading? couldn't they have been leading?