I could detain you could detain he could detain we could detain you could detain they could detain
V-ing form
I could be detaining you could be detaining he could be detaining we could be detaining you could be detaining they could be detaining
Perfect
I could have detained you could have detained he could have detained we could have detained you could have detained they could have detained
V-ing perfect
I could have been detaining you could have been detaining he could have been detaining we could have been detaining you could have been detaining they could have been detaining
Negation
Simple form
I could not detain you could not detain he could not detain we could not detain you could not detain they could not detain
V-ing form
I could not be detaining you could not be detaining he could not be detaining we could not be detaining you could not be detaining they could not be detaining
Perfect
I could not have detained you could not have detained he could not have detained we could not have detained you could not have detained they could not have detained
V-ing perfect
I could not have been detaining you could not have been detaining he could not have been detaining we could not have been detaining you could not have been detaining they could not have been detaining
Interrogative form
Simple form
could I detain? could you detain? could he detain? could we detain? could you detain? could they detain?
V-ing form
could I be detaining? could you be detaining? could he be detaining? could we be detaining? could you be detaining? could they be detaining?
Perfect
could I have detained? could you have detained? could he have detained? could we have detained? could you have detained? could they have detained?
V-ing perfect
could I have been detaining? could you have been detaining? could he have been detaining? could we have been detaining? could you have been detaining? could they have been detaining?
Interro-negative form
Simple form
could I not detain? could you not detain? could he not detain? could we not detain? could you not detain? could they not detain?
V-ing form
could I not be detaining? could you not be detaining? could he not be detaining? could we not be detaining? could you not be detaining? could they not be detaining?
Perfect
could I not have detained? could you not have detained? could he not have detained? could we not have detained? could you not have detained? could they not have detained?
V-ing perfect
could I not have been detaining? could you not have been detaining? could he not have been detaining? could we not have been detaining? could you not have been detaining? could they not have been detaining?