must remain
Regular verb: remain - remained- remained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must remain
you must remain
she must remain
we must remain
you must remain
they must remain 	I must be remaining
you must be remaining
she must be remaining
we must be remaining
you must be remaining
they must be remaining	I must have remained
you must have remained
she must have remained
we must have remained
you must have remained
they must have remained	I must have been remaining
you must have been remaining
she must have been remaining
we must have been remaining
you must have been remaining
they must have been remaining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not remain
you must not remain
she must not remain
we must not remain
you must not remain
they must not remain 	I must not be remaining
you must not be remaining
she must not be remaining
we must not be remaining
you must not be remaining
they must not be remaining	I must not have remained
you must not have remained
she must not have remained
we must not have remained
you must not have remained
they must not have remained	I must not have been remaining
you must not have been remaining
she must not have been remaining
we must not have been remaining
you must not have been remaining
they must not have been remaining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I remain?
must you remain?
must she remain?
must we remain?
must you remain?
must they remain? 	must I be remaining?
must you be remaining?
must she be remaining?
must we be remaining?
must you be remaining?
must they be remaining? 	must I have remained?
must you have remained?
must she have remained?
must we have remained?
must you have remained?
must they have remained? 	must I have been remaining?
must you have been remaining?
must she have been remaining?
must we have been remaining?
must you have been remaining?
must they have been remaining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not remain?
must you not remain?
must she not remain?
must we not remain?
must you not remain?
must they not remain? 	must I not be remaining?
must you not be remaining?
must she not be remaining?
must we not be remaining?
must you not be remaining?
must they not be remaining? 	must I not have remained?
must you not have remained?
must she not have remained?
must we not have remained?
must you not have remained?
must they not have remained? 	must I not have been remaining?
must you not have been remaining?
must she not have been remaining?
must we not have been remaining?
must you not have been remaining?
must they not have been remaining?