must nag
Regular verb: nag - nagged- nagged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must nag
you must nag
he must nag
we must nag
you must nag
they must nag 	I must be nagging
you must be nagging
he must be nagging
we must be nagging
you must be nagging
they must be nagging	I must have nagged
you must have nagged
he must have nagged
we must have nagged
you must have nagged
they must have nagged	I must have been nagging
you must have been nagging
he must have been nagging
we must have been nagging
you must have been nagging
they must have been nagging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I must not nag
you must not nag
he must not nag
we must not nag
you must not nag
they must not nag 	I must not be nagging
you must not be nagging
he must not be nagging
we must not be nagging
you must not be nagging
they must not be nagging	I must not have nagged
you must not have nagged
he must not have nagged
we must not have nagged
you must not have nagged
they must not have nagged	I must not have been nagging
you must not have been nagging
he must not have been nagging
we must not have been nagging
you must not have been nagging
they must not have been nagging	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I nag?
must you nag?
must he nag?
must we nag?
must you nag?
must they nag? 	must I be nagging?
must you be nagging?
must he be nagging?
must we be nagging?
must you be nagging?
must they be nagging? 	must I have nagged?
must you have nagged?
must he have nagged?
must we have nagged?
must you have nagged?
must they have nagged? 	must I have been nagging?
must you have been nagging?
must he have been nagging?
must we have been nagging?
must you have been nagging?
must they have been nagging? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
must I not nag?
must you not nag?
must he not nag?
must we not nag?
must you not nag?
must they not nag? 	must I not be nagging?
must you not be nagging?
must he not be nagging?
must we not be nagging?
must you not be nagging?
must they not be nagging? 	must I not have nagged?
must you not have nagged?
must he not have nagged?
must we not have nagged?
must you not have nagged?
must they not have nagged? 	must I not have been nagging?
must you not have been nagging?
must he not have been nagging?
must we not have been nagging?
must you not have been nagging?
must they not have been nagging?