I could detour you could detour she could detour we could detour you could detour they could detour
V-ing form
I could be detouring you could be detouring she could be detouring we could be detouring you could be detouring they could be detouring
Perfect
I could have detoured you could have detoured she could have detoured we could have detoured you could have detoured they could have detoured
V-ing perfect
I could have been detouring you could have been detouring she could have been detouring we could have been detouring you could have been detouring they could have been detouring
Negation
Simple form
I could not detour you could not detour she could not detour we could not detour you could not detour they could not detour
V-ing form
I could not be detouring you could not be detouring she could not be detouring we could not be detouring you could not be detouring they could not be detouring
Perfect
I could not have detoured you could not have detoured she could not have detoured we could not have detoured you could not have detoured they could not have detoured
V-ing perfect
I could not have been detouring you could not have been detouring she could not have been detouring we could not have been detouring you could not have been detouring they could not have been detouring
Interrogative form
Simple form
could I detour? could you detour? could she detour? could we detour? could you detour? could they detour?
V-ing form
could I be detouring? could you be detouring? could she be detouring? could we be detouring? could you be detouring? could they be detouring?
Perfect
could I have detoured? could you have detoured? could she have detoured? could we have detoured? could you have detoured? could they have detoured?
V-ing perfect
could I have been detouring? could you have been detouring? could she have been detouring? could we have been detouring? could you have been detouring? could they have been detouring?
Interro-negative form
Simple form
could I not detour? could you not detour? could she not detour? could we not detour? could you not detour? could they not detour?
V-ing form
could I not be detouring? could you not be detouring? could she not be detouring? could we not be detouring? could you not be detouring? could they not be detouring?
Perfect
could I not have detoured? could you not have detoured? could she not have detoured? could we not have detoured? could you not have detoured? could they not have detoured?
V-ing perfect
could I not have been detouring? could you not have been detouring? could she not have been detouring? could we not have been detouring? could you not have been detouring? could they not have been detouring?