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