should register
Regular verb: register - registered- registered

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I'd register
you'd register
she'd register
we'd register
you'd register
they'd register 	I'd be registering
you'd be registering
she'd be registering
we'd be registering
you'd be registering
they'd be registering	I should've registered
you should've registered
she should've registered
we should've registered
you should've registered
they should've registered	I should've been registering
you should've been registering
she should've been registering
we should've been registering
you should've been registering
they should've been registering	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I shouldn't register
you shouldn't register
she shouldn't register
we shouldn't register
you shouldn't register
they shouldn't register 	I shouldn't be registering
you shouldn't be registering
she shouldn't be registering
we shouldn't be registering
you shouldn't be registering
they shouldn't be registering	I shouldn't have registered
you shouldn't have registered
she shouldn't have registered
we shouldn't have registered
you shouldn't have registered
they shouldn't have registered	I shouldn't have been registering
you shouldn't have been registering
she shouldn't have been registering
we shouldn't have been registering
you shouldn't have been registering
they shouldn't have been registering	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
should I register?
should you register?
should she register?
should we register?
should you register?
should they register? 	should I be registering?
should you be registering?
should she be registering?
should we be registering?
should you be registering?
should they be registering? 	should I have registered?
should you have registered?
should she have registered?
should we have registered?
should you have registered?
should they have registered? 	should I have been registering?
should you have been registering?
should she have been registering?
should we have been registering?
should you have been registering?
should they have been registering? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
shouldn't I register?
shouldn't you register?
shouldn't she register?
shouldn't we register?
shouldn't you register?
shouldn't they register? 	shouldn't I be registering?
shouldn't you be registering?
shouldn't she be registering?
shouldn't we be registering?
shouldn't you be registering?
shouldn't they be registering? 	shouldn't I have registered?
shouldn't you have registered?
shouldn't she have registered?
shouldn't we have registered?
shouldn't you have registered?
shouldn't they have registered? 	shouldn't I have been registering?
shouldn't you have been registering?
shouldn't she have been registering?
shouldn't we have been registering?
shouldn't you have been registering?
shouldn't they have been registering?