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