should nag
Regular verb: nag - nagged- nagged

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd nag
you'd nag
he'd nag
we'd nag
you'd nag
they'd nag 	I'd be nagging
you'd be nagging
he'd be nagging
we'd be nagging
you'd be nagging
they'd be nagging	I should've nagged
you should've nagged
he should've nagged
we should've nagged
you should've nagged
they should've nagged	I should've been nagging
you should've been nagging
he should've been nagging
we should've been nagging
you should've been nagging
they should've been nagging	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't nag
you shouldn't nag
he shouldn't nag
we shouldn't nag
you shouldn't nag
they shouldn't nag 	I shouldn't be nagging
you shouldn't be nagging
he shouldn't be nagging
we shouldn't be nagging
you shouldn't be nagging
they shouldn't be nagging	I shouldn't have nagged
you shouldn't have nagged
he shouldn't have nagged
we shouldn't have nagged
you shouldn't have nagged
they shouldn't have nagged	I shouldn't have been nagging
you shouldn't have been nagging
he shouldn't have been nagging
we shouldn't have been nagging
you shouldn't have been nagging
they shouldn't have been nagging	

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

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