must detain
Regular verb: detain - detained- detained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must detain
you must detain
she must detain
we must detain
you must detain
they must detain 	I must be detaining
you must be detaining
she must be detaining
we must be detaining
you must be detaining
they must be detaining	I must have detained
you must have detained
she must have detained
we must have detained
you must have detained
they must have detained	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 	V-ing form 	Perfect 	V-ing perfect 	
I must not detain
you must not detain
she must not detain
we must not detain
you must not detain
they must not detain 	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	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	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 	V-ing form 	Perfect 	V-ing perfect 	
must I detain?
must you detain?
must she detain?
must we detain?
must you detain?
must they detain? 	must I be detaining?
must you be detaining?
must she be detaining?
must we be detaining?
must you be detaining?
must they be detaining? 	must I have detained?
must you have detained?
must she have detained?
must we have detained?
must you have detained?
must they have detained? 	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 	V-ing form 	Perfect 	V-ing perfect 	
must I not detain?
must you not detain?
must she not detain?
must we not detain?
must you not detain?
must they not detain? 	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? 	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? 	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?